{
  "manageEntity": {
    "action": "Save",
    "entityId": "648905",
    "entityType": "Track",
    "nonce": "0x87c38cc47ea55e06dd409171b9c34d5c974f0bbd5290b3aca3914c43ce0b5bd2",
    "signature": "0x04a3a4a8efca1da20ca4fd5fbbb9b37b12cf2dae1c44f488a9dd2fea1cf0a9f75a450fd3846b9daebf03c1584f8578b6d2a886e6925ae1a9fbdb145a4c29f72c1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}