{
  "manageEntity": {
    "action": "Save",
    "entityId": "1389550150",
    "entityType": "Track",
    "nonce": "0x9faa862744f440b00c64212c0bbae86f20bc98db6ffefb6f49718a611c9bc221",
    "signature": "0xc36b27d0f9185a2e2b6d8ce7a8baddb5c00a056d80bb31cd36d73633574cd9b3751441e56748c10deaded0222345669b779f5750509ae3d93fb0e365a9f327b11c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}