{
  "manageEntity": {
    "action": "Save",
    "entityId": "77763197",
    "entityType": "Track",
    "nonce": "1787557659399479054",
    "signature": "0xb1687ceb1c3cb78c5b55f6dceacc8c5a1e5646d4177af5047deede1f62817309526eb8ef9600eada21343975357e8f68307c42fc83ae72280ff1053f16e6dff11c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}