{
  "manageEntity": {
    "action": "Save",
    "entityId": "306938",
    "entityType": "Track",
    "nonce": "0x509db75527458acb2c307f93d0032d74888b7c0ceea31905891986d7903c3934",
    "signature": "0x4f9e17916bf9e4285e83107ac4e99f7a896b7a9177e8c409b3ef15c3235cea25464a0b23e9eba49c656bd1bb4d3c42e5870f6e0eb9639a2c2a39395a00bfe9721c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}