{
  "manageEntity": {
    "action": "Save",
    "entityId": "489672535",
    "entityType": "Track",
    "nonce": "0x8b74b4105054a5fa58ec4c166c2681c70194f92965f090a9e75dce722bc6295e",
    "signature": "0xe6374c855ecad49b2c687e227f7c81b872ddcf43254805a9ff03c89a40e72100753290cec50f06c7e6b9913b753c30b7f2acddd3122053a02b82ec6ea73dd8dd1b",
    "signer": "0x4500303E05fBbcF978dbd09d73Dc6e8084A6f1b0",
    "userId": "834909005"
  }
}