{
  "manageEntity": {
    "action": "Save",
    "entityId": "1557416360",
    "entityType": "Track",
    "nonce": "1786303772629587705",
    "signature": "0x66ba0635a935663fcc18035c366148fd828794e9b79e300b856a8d5aef27d3b931ee46f142ee7af3a60a3d1880f5a163212ee7af040f6137961548e3ea3b0a1c1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}