{
  "manageEntity": {
    "action": "Save",
    "entityId": "877464806",
    "entityType": "Track",
    "nonce": "0xbe0322248249dc03bf499f91e4d8da995c478344f82e1f8a1cb834916ca39275",
    "signature": "0x8fd3a292aafd6948a924c6400b157aeaa0a48cbd5bd89ea3e89c0432729b9ca420c2bd6343082aae34a161f6d901047f6c544bb10ccb0218a8ad563bea2932971c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}