{
  "manageEntity": {
    "action": "Save",
    "entityId": "1407314386",
    "entityType": "Track",
    "nonce": "0xc52812dc9157e61d58faffdf7844b473acd73cac0ce7e42f26c4d60f8e78058a",
    "signature": "0x541564f7d5628d632b8a480790998282319cdcd0194fb806ed10b4ba0cc21daa7a3cadb4467f172ca8e544c7da509c4886cb37bc8fec050ed11823d566a6647a1c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}