{
  "manageEntity": {
    "action": "Save",
    "entityId": "499729774",
    "entityType": "Track",
    "nonce": "0xe7d84f3d4b1090639dcf0dd3239e2020e831231a4f46e76fce0a601b0f5c798e",
    "signature": "0x5fc900a8c09a6a147ecc2ce88a4053f602ca06560d0110f46ccb2578fc477f8849f39e5432282da434ea9d47585525b8ce31045ef497caa0a13f5dca376cdf6e1b",
    "signer": "0xAd15470171ba4f01ad3C714600D9A7E9aE62485C",
    "userId": "714646433"
  }
}