Claims

Claims store plain data on the blockchain, Usually it is used in conjunction with datum.set and instead of storing data we store data item ID

To be GDPR compliant DON'T store plain data on the blockchain since it will not be deleted

addClaim

Add a claim

NOTE: value of claim should be the storage address. See set() operation on how to store data.

Parameters

1. String - Subject to add the claim
2. String - Key of the claim
3. String - Value of the claim - ie address id of data

Returns

Promise with transaction result

Example

datum.addClaim('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa', '0xE4d3Df777CaD70A6b0048bc572Fd3f843751529E','ANY VALUE')

getClaim static

Return the value of the claim for given issuer, subject and key

Parameters

1. String - issuer that created the claim
2. String - subject/wallet address for the claim
3. String - key name of the claim

Returns

Promise

Example

Datum.getClaim("0x6e585cc6047a55a793d1E922afE28BaefaBcd73C","0x6e585cc6047a55a793d1E922afE28BaefaBcd73C", "0x656d61696c");

getClaims static

Returns an array of claims object with issuer, subject, key ,value

Parameters

1. String - subject address of claims

Returns

Promise array of claims

Example

Datum.getClaims("0x6e585cc6047a55a793d1E922afE28BaefaBcd73C");

Result

[{  issuer: '0x5aB36c692D5bCD2713239307F96212110a298f3E',
    subject: '0x5aB36c692D5bCD2713239307F96212110a298f3E',
    key: 'Age',
    value: '80' } ]

getClaimsByIssuer static

Returns an array of claims object with issuer, subject, key ,value

Parameters

1. String - issuer address of claims

Returns

Promise array of claims

Example

Datum.getClaims("0x6e585cc6047a55a793d1E922afE28BaefaBcd73C");

Result

[{  issuer: '0x5aB36c692D5bCD2713239307F96212110a298f3E',
    subject: '0x5aB36c692D5bCD2713239307F96212110a298f3E',
    key: 'Age',
    value: '80' } ]

removeClaim

Removes a claim. Can only be done by issuer or subject of the claim.

NOTE: removing claim WILL NOT remove storage assoicated. See remove() on how to remove storage data.

Parameters

1. String - Issuer of the claim
2. String - Subject to add the claim
3. String - Key of the claim

Returns

Promise with transaction result

Example

datum.removeClaim('0xb57f5f92f8931e044f59d54f7f2a445e5dd274e16599f104a61a8dd4cfa5b0fa', '0xE4d3Df777CaD70A6b0048bc572Fd3f843751529E', 'MY_KEY');

verifyClaim

Returns true if the claim exists and signed by the issuer, false if claim not exists or signed by someone else.

Parameters

1. String - issuer of the claim
2. String - subject of the claim
3. String - key name of the claim

Returns

Promise with true or false

Example

//static
Datum.verifiyClaim("0xc90a556e6381b0c6acdaf1e00e41f101e495762f","0xbddb8404281d830de5e200eb241aec3c97d885bc","0x1230000000000000000000000000000000000000000000000000000000000000")

Result

false