{
  "manageEntity": {
    "action": "Save",
    "entityId": "809591340",
    "entityType": "Track",
    "nonce": "0x1af7b8becad2323e7064ee85d3108365caa0419395356d518be6f7e15f3c3fd2",
    "signature": "0x5ea1c692aef478eae811714a2ba411ebbbbe390bee3305ca78f9b662262493db17118a110662e5f210770b5b4c17201f7e8182f8ad42f16359b1bfd4ede6def21c",
    "signer": "0x6F66f681e2e3f84ABb456ddC94785dadfA3E1B4B",
    "userId": "677737335"
  }
}