{
  "manageEntity": {
    "action": "Save",
    "entityId": "543541555",
    "entityType": "Track",
    "nonce": "1787905138427677895",
    "signature": "0x04fdd2866bb76172cd5a56587c68f5114cb53f77ebc4c2ad6c8259cf46bcdebc5fb83b2ff44957e5ad07ba6bea88a50d541ac2996475367cb46e0419b26e94951c",
    "signer": "0x6620103988B969bE5810F1B5530c1A44Fe6048A1",
    "userId": "568518925"
  }
}