{
  "manageEntity": {
    "action": "Save",
    "entityId": "1963400828",
    "entityType": "Track",
    "nonce": "0x8c5724ff1e33a08894ef16f6b8d58c9fbacd53f2c13098fd0b2437d7da25123e",
    "signature": "0xb549a91d8effa0606f6dc2893193782f069778899c70428bb3519968d55ddd9b578d88f239d5ef3c54920a5e01b55b46db799572185c882483bb474d4abe2c791b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}