{
  "manageEntity": {
    "action": "Save",
    "entityId": "1817383460",
    "entityType": "Track",
    "nonce": "1792323478412937063",
    "signature": "0xb43a177133565a5a69bd6236732e903e54482f45854a1022e2bbec30f4e988e86670a3d16b279902728d6274d838449446492925b25da411a78c2ffbd509442f1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}