{
  "manageEntity": {
    "action": "Save",
    "entityId": "602042764",
    "entityType": "Track",
    "nonce": "0x328c6024e1bdfc27764d8008b3b95e7d47831feb141e785d03a14b0e5a2c4709",
    "signature": "0x64d67e76e25869423ebbe676e94de7a7f20c2e5e5ac3b6a3be88cb905dd0c077145e067e510e3a7566e058c9737cb0734f524945fa430b617becbca71a8a9e9a1b",
    "signer": "0x793bbEFbb3Cf1e6529B90296e502145aCcCDE8d6",
    "userId": "838777725"
  }
}