{
  "manageEntity": {
    "action": "Save",
    "entityId": "476021779",
    "entityType": "Track",
    "nonce": "0x33436cec9eafd1bff7be3098bd9c4ae5a81788a82521059f57ab9a52e609e623",
    "signature": "0x90deaa5961b63be2a50639747b1864d91f9e270294dddee75e96e812b1f9067a5629325ee781cb42fc111eaee48cc8ee1abe09eee4a84d8a7a6ed6840efaaf6a1c",
    "signer": "0x84B42609E987DD0953e02498E61987fB833B7C92",
    "userId": "887547386"
  }
}