3. FEIP17V3_Safe(en-US)

FEIP17V3_Safe(en-US)

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    FEIP17: Safe
Version: 3
Language: en-US
Author: C_armX, Deisler-JJ_Sboy，Free_Cash
Status: draft
Created date: 2021-03-07
Last modified date：2022-04-22
File hash: ""
TXid:

    FEIP17V3_Safe(en-US)

    Contents

    Metadata

    About FEIP

    About this protocol

    Add

    Delete

    Recover

    Metadata

    Protocol type: FEIP
Serial number: 17
Protocol name: Safe
Version: 3
Description : Save encrpted important data on the blockchain of FCH.
Author: C_armX, Deisler-JJ_Sboy，Free_Cash
Language: en-US
Previous version hash:"ea73a3501179224636d2939f1b2e2f581052d0632bacae3b677cc3805157de96"

    About FEIP

    1. Write important data in OP_RETURN for public witness under FEIP type protocols.

    2. The SIGHASH flag of all transaction inputs is ‘ALL’ (value 0x01).

    3. The max size of OP_RETURN : 4096 bytes.

    4. The format of the data in op_return: JSON.

    5. Encoding : utf-8.

    About this protocol

    1. This protocol helps users to write encrypted personal information in the blockchain of FCH.

    2. Use the public key of the first output address to encrypt the message.

    3. The item belongs to the safe of the first input address of the transaction that adds it.

    4. Only the address who added the item can delete or recover it.

    5. When updating an item, just delete it and add a new one.

    Add

    When user adds a new item, the OP_RETURN contains the data as follows:

    field number field name type length content required
    1 type String 4 Fixed: "FEIP"<br>Case insensitive Y
    2 sn int 2 Serial number<br>Fixed: 17 Y
    3 ver int 1 Fixed: 3 Y
    4 name String 4 Fixed: "Safe"<br>Case insensitive N
    5 hash hex 32 Sha256 value of this protocol file N
    6 data.op string 3 operation: "add" Y
    7 data.alg string 1-32 The encrypt algorithm.<br>"ECC256k1-AES256CBC" is recommended. Y
    8 data.ciphertext string 1-2048 Encrypted message Y

    Decrypted data of data.ciphertext

    field number field name type length content required
    1 type string 16 Customized by the user or App N
    2 title string 128 Title, account, or other.<br>Depends on "type". N
    3 content string 1024 Text, password, or other. <br>Depends on "type". Y
    4 memo string 256 N

    Example for adding an item

    The address of first output: FEk41Kqjar45fLDriztUDTUkdki7mmcjWK
Publickey: 6vU3ZMpwggurw92AUy1Vi6WBxEnBPdjupXGKD7Q5Zcw8yvdJAf
Privatekey: L2bHRej6Fxxipvb4TiR5bu1rkT3tRp8yWEsUy4R1Zb8VMm2x7sd8

OP_RETURN content:

{
    "type": "FEIP",
    "sn": 17,
    "ver": 3,
    "name": "Safe",
    "hash": "",
    "data":{
        "op": "add",
        "alg": "ECC256k1-AES256CBC",
        "ciphertext": "AjTU0rGQvDxhCs3F5x4Pcz3Bsiiry2LryPcKcPIZ2iDsD68U5he9FkM6AVUzEHTjmfBLkhfFu7rv4fveoyMi5YH+wQoiWDxgs/MYjGZBL/Fuq6XZ6IOCXfWyfwphE4uxhEg5TD9ZBRsrJbNxwbdfee5ev5Gvc8kwYROycs0sAG3rNdoJbEZZ7bs2DqvHbAWdG7w4gYLhP9o+C/xVTZHz7Ks9VHb6i04/1at40etlWXxPWSvkdDWxTtyWSSsY2jrbYjfe+ytXQRTRY4gYQdwg+9s="
        }
}

Decrypted information of data.ciphertext:

{
    "type": "password",
    "title": "john@gmail.com",
    "content": "123456",
    "memo": "https://www.gmial.com"
}

    Delete

    When user deletes an item, the OP_RETURN contains the data as follows:

    field number field name type length content required
    1 type String 4 Fixed: "FEIP"<br>Case insensitive Y
    2 sn int 2 Serial number<br>Fixed: 17 Y
    3 version int 1 Fixed: 3 Y
    4 name String 4 Fixed: "Safe"<br>Case insensitive N
    5 hash hex 32 Sha256 value of this protocol file N
    6 data.op string 3 operation: "delete" Y
    7 data.addTxid string 64 The txid in which the item was added. Y

    Example for deleting an item

    {
    "type": "FEIP",
    "sn": 17,
    "ver": 3,
    "name": "Safe",
    "hash": "",
    "data":{
        "op": "delete",
        "addTxid": "/*The txid in which the item was added.*/"
    }
}

    Recover

    When user recovers an item, the OP_RETURN contains the data as follows:

    field number field name type length content required
    1 type String 4 Fixed: "FEIP"<br>Case insensitive Y
    2 sn int 2 Serial number<br>Fixed: 17 Y
    3 version int 1 Fixed: 3 Y
    4 name String 4 Fixed: "Safe"<br>Case insensitive N
    5 hash hex 32 Sha256 value of this protocol file N
    6 data.op string 3 operation: "recover" Y
    7 data.addTxid string 64 The txid in which the item was added. Y

    Example for recovering an item

    {
    "type": "FEIP",
    "sn": 17,
    "ver": 3,
    "name": "Safe",
    "hash": "",
    "data":{
        "op": "recover",
        "addTxid": "/*The txid in which the item was added.*/"
    }
}
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