{
  "manageEntity": {
    "action": "Save",
    "entityId": "502216567",
    "entityType": "Track",
    "nonce": "0x8ac8f7a7ac2927ba0753160baa2ac5b05194741a04dca6ecbdcb4517e14a1601",
    "signature": "0xd13cdba25c7fde7bcff7da92227a6b093deac6fe8702c4437b559fea0960ff0043a28a837b77ca0b7cf173715556c174eb917b08b90c60e0dc021d209330d47b1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}