{
  "manageEntity": {
    "action": "Save",
    "entityId": "903673025",
    "entityType": "Track",
    "nonce": "0x47ac3dc0d4d0e19ed306b1df1d7a15ad18f3d9ad3099d0329aae95cb92612243",
    "signature": "0xaecef5a4fbb7309e3ec71cdbd3f697a69841908a94554d2f8a1e0f2d46b1849a0fa784be7cec3871fe411aa86297bddb3784aca8cab23e426dc0cd8ba545db251b",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}