{
  "manageEntity": {
    "action": "Save",
    "entityId": "783806567",
    "entityType": "Track",
    "nonce": "0x9cafe9a94ba8476df59f8804ea984fc680d9c91ecb6bd4805873cc2d9219ca00",
    "signature": "0x5d2d0d2743a258aa6626eff5e36f36d7d50e28abadf06d271ba9c71fc3f8b54d5783b16e1335bd5f9fa136b12a6fa2de5d9bfa4bd3d6b6522a2da53bdd3b0e4c1b",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}