{
  "manageEntity": {
    "action": "Save",
    "entityId": "129814333",
    "entityType": "Track",
    "nonce": "1788376350378643521",
    "signature": "0x2a534ddbb8ae904c4be646f4606794f4e0080e4eadaeecb660fc1d8d592acba367356266162e75c76fcae9cb6a4169f52b8b825bd91877dc80aa9f52f465ec901b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}