{
  "manageEntity": {
    "action": "Save",
    "entityId": "289061809",
    "entityType": "Track",
    "nonce": "0x2c5781ce5ff2bc864d1baf977683672d17781c2279b2dd4c8536dd1a54f1f079",
    "signature": "0x64d91cdda983ccf96b09532b022221bcd7fbaf6ad1f628df71456783603d3064287e6b65e923dac8b9202f40777b050587d92833482e150058d80c95d55f22df1b",
    "signer": "0x7451Cf52e883bc4483b88591c194dc3942E7F191",
    "userId": "584186978"
  }
}