{
  "manageEntity": {
    "action": "Save",
    "entityId": "57773",
    "entityType": "Track",
    "nonce": "0xbc6bbe3b28d4f79bf62cc370e2bb91e68f6c867252e2e23e440819c88a283ef2",
    "signature": "0xb7b86e70e011ad51ed6ef2444c63f62086595282ddee735bacdc19d500078cca1553f4c8a470e9615a2035e5f127b89e77d7252f045be7f78b61b887244e44041c",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}