{
  "manageEntity": {
    "action": "Save",
    "entityId": "504759761",
    "entityType": "Track",
    "nonce": "0x6e6fa72736da5912ed50e5f82f66b5eb4507e155eeb5082daef0bdebd71d24cf",
    "signature": "0x6a544ebc40c696656eb6f7e1a81b136940e601a9d0a520e70caf497b74d5372c7a1a3533f651594ddb10c4083da3a0ac9868fdcc9d52515be247494b6885efed1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}