{
  "manageEntity": {
    "action": "Save",
    "entityId": "687709847",
    "entityType": "Track",
    "nonce": "1793395608239661744",
    "signature": "0xecc05ffe02eb68138d6f4b1838c993f9ead09447ca5db3488bfda1a6d429e70d5e004522b8f2d177a87b09c46549c4f84bb93d3a1a64bcc7c426e7eb45645e6a1b",
    "signer": "0xE9e5656ce6F7Fe41FDbCA982901407eB55765cD3",
    "userId": "670307808"
  }
}