{
  "manageEntity": {
    "action": "Save",
    "entityId": "768749",
    "entityType": "Track",
    "nonce": "0x78d4a9df13b639e33532322c41af440f2ea84f80387827f1dbe783d7aae1e189",
    "signature": "0x65604a0e8af7fe3b37f97f95a746aa0470f5090c1e4e7f13b0d328d1001b1b1703d6ef6a395eb2c6c2a7d83edf9bf17c11db0ac0a54a5372375709e8fbb745e31c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}