{
  "manageEntity": {
    "action": "Save",
    "entityId": "1209157591",
    "entityType": "Track",
    "nonce": "0x63e71c1c1b052729c7d4c0ca29f08c2a3e9c25f83dd8916e5e829bf19992e51a",
    "signature": "0x16efb4eaabeafdfb401827d7b70c3e65e1bb1106ef7f9dcfcfc46eeaada516891d88894928272ba358e3f5fd73eb071bb5bb6bf9f8f4c9ea83713334656aba3b1c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}