{
  "manageEntity": {
    "action": "Save",
    "entityId": "445640515",
    "entityType": "Track",
    "nonce": "0x25623ee9485c98d7256e04e2a6e85ab06b6f1cdc3f3605c96bbe236162817849",
    "signature": "0x2aa5746675f294258bcc9db82c4cf417af964ff982518469ec379a0bcb1b81ce71015460d152fd0116a6ed756bc337e7f018a75214e89bb1a5fc48de55f3ae8c1c",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}