{
  "manageEntity": {
    "action": "Save",
    "entityId": "1204960605",
    "entityType": "Track",
    "nonce": "0x91ab573923831729ad313ec20bb1e1d54ede1a4832ffcb262cf83790847afcbe",
    "signature": "0x2415428f713fbfd71e41553b66ad716efc3bcfe7ec2818959a9fbd1eb92412d505bce3b14972f9970ee6e7bfb54e6f24fcc7a55787cd5d522754fc34597cd1db1c",
    "signer": "0xcdc1772589e70ee6667FAaC93E3F0CcD5BFDa2aE",
    "userId": "354908"
  }
}