{
  "manageEntity": {
    "action": "Save",
    "entityId": "544166",
    "entityType": "Track",
    "nonce": "0x64b5bfd30a6f3fce8bab19469bf1c2299cdc8ee3d43afee3a20c518a5dfdbfba",
    "signature": "0xfdba79c4dbfa907a0cb41f21249b2ee84d5a489c7d97e5e09fd70f153e90646135ed94b37a4edabe862c5ed44360f174ea01e3f29bf3ad843f48506fbbe6a51b1c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}