{
  "manageEntity": {
    "action": "Save",
    "entityId": "1777818342",
    "entityType": "Track",
    "nonce": "0x03a550c9c4db9f38858dde7512f931186e272746c4268a4ad93ee593874315c6",
    "signature": "0xb074bb2077572125c421c230704570ef70a7df251103d86f4ec535edadc86ada37ad1ba85fd3ecb1350166043bec6c806ca779b5112e04178a18365a8209a7e11b",
    "signer": "0xD967b68365738013c9197659aAb46EB73a488080",
    "userId": "488430169"
  }
}