{
  "manageEntity": {
    "action": "Save",
    "entityId": "1537309719",
    "entityType": "Track",
    "nonce": "0xd254c1a33ac5b53c9d8b5ca43082557ebd6cdfd34f8ee4f0f7bc43e041a2f1a6",
    "signature": "0xdc46155a3c9d045dbf7c40cb6fa1e9ec87c0396ee82be831808a64bd466533ee5fab1a0ca21f269331471fdceecddeeb0b142a5232fe92160b01bbeb9f4a71751b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}