{
  "manageEntity": {
    "action": "Save",
    "entityId": "1469508689",
    "entityType": "Track",
    "nonce": "0xdb53f51b3a1d03c7bd0b895c112b78b35dba927d12c1500728ae3880de3550eb",
    "signature": "0x9b66533b77f60b94d420d4131791700de2f89f31542649124acf552f9ae617fb48ab40762cbe3fc6d4660f4bc748d02f568507c0c2f5e939fc994cd76dc4bfcc1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}