{
  "manageEntity": {
    "action": "Save",
    "entityId": "531033",
    "entityType": "Track",
    "nonce": "0x19473f0d6f9301acd55ffa3b5a407a5d2b9bd64d480beb12063ad04fe0ce14a5",
    "signature": "0x1cee1a98ab28c96dc41cc6c78129182bdc705cf8a1e7d801fcbc85570fd6a1940e7252decfd837fc58e3d5e3355cb7cdc1c8ef98b9dc38f39f7e6368632ebeb31c",
    "signer": "0x44BAdCFCf42113CbB67f519e4efa576B336f9bf7",
    "userId": "136844578"
  }
}