{
  "manageEntity": {
    "action": "Save",
    "entityId": "902027965",
    "entityType": "Track",
    "nonce": "0xdae43fa8d81ae6db5b45615044f8ce7615129f2fdd723ce5178e06569ed3ac9e",
    "signature": "0x265fc2f03a880c4cc38324803059739d4a8d1895fbb24e944cad7ee63cf2ed5c2f972cb8b22145695075b2cf2e1ae89a51340c72e165b1370867d5b1d867adcb1b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}