{
  "manageEntity": {
    "action": "Save",
    "entityId": "705278482",
    "entityType": "Track",
    "nonce": "0x52d50da35aef925a515f0cda16eca5288658186e6a1aa78bde0c867f86057fad",
    "signature": "0x3387146109d11afef10c7628a738e12f0e75838e3731f06e097c838aaf243487700f64d84f6a7fb30a6c2766c4eaa712d978d8fbe3285a074aa8efbb5595e7321b",
    "signer": "0xa7B72be225A796b97FD34C11f9D57337bb58B341",
    "userId": "883910521"
  }
}