{
  "manageEntity": {
    "action": "Save",
    "entityId": "1245783402",
    "entityType": "Track",
    "nonce": "0x1dcdfa262f6f515adcc62d8e6c699cdffc8007dccb21a21303afc6ed90e90e10",
    "signature": "0xa243c090ed16e70fea4d5ac3fed705abb10e76480d79e4685613bf660f0ac6f9032a3774872b7a9731db253dc7b2fa857711710faf3c9d454cd5a8db2cadf9a01c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}