{
  "manageEntity": {
    "action": "Save",
    "entityId": "291541396",
    "entityType": "Track",
    "nonce": "0x5f0c9c79c8b3952e6547ec99ae01359ab4d0dbdf64cb54aa51d7b85c6293f328",
    "signature": "0xbdd11afa4b099d7c4f89a73ca30f98748f51d6f99f3c0d4b84290da667f87ef742254c2b9e50ae3fe6db2432592b19d5f0794257af2801f21f59d1df59f54f5a1b",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}