{
  "manageEntity": {
    "action": "Save",
    "entityId": "679449038",
    "entityType": "Track",
    "nonce": "0x2cf07fd40bc640d521b874cda684db2208b44e7daa510496e8a22a49668be2b9",
    "signature": "0x4c28c353185520c763ebc0636a60d3dd970e5999b0f730555e107414b02c3f88142fa9581a9bdd2c98ba92e01b49f0a1badb903f6ba66e4494d4321b06861f9c1c",
    "signer": "0x5fa60F185681545769de01098bB8F29cfbaE3cF0",
    "userId": "489026160"
  }
}