{
  "manageEntity": {
    "action": "Save",
    "entityId": "1215764237",
    "entityType": "Track",
    "nonce": "0x75531ac0baa4ed3dd559b6d1ffd63e96bd67bb6747dcefd931208a40f0312b60",
    "signature": "0x6b0c56b0aa0a9cf0ded9b42884b0e82e7904c357321e41ed64dd2f84ca840df35f9ec0dd5ccdafe6ab6f9b75f23d598f23f5fa90f7444c15442202a8131fce241c",
    "signer": "0x767f09338Ac6CE8645c0a76a17a560429b582132",
    "userId": "520958130"
  }
}