{
  "manageEntity": {
    "action": "Save",
    "entityId": "1687462277",
    "entityType": "Track",
    "nonce": "0x71a8dac4aeeb0a0bcd064258272f2794c65f29ec026f412ef6311377e69c5b97",
    "signature": "0x8c4a85b53ae5af96e916381b940adc40cad19c0469ab8a317af402e9bff8289522e795cbfb3f07854939c70307b385633ade1038e1b6e81b77b716c33bd4cb071c",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}