{
  "manageEntity": {
    "action": "Save",
    "entityId": "1609184913",
    "entityType": "Track",
    "nonce": "0x7494b81dc7209392cb1d5515bcea280015401ec9715240b2db8151af1f882e82",
    "signature": "0x8dd40b05672cc51d41fb02e54534b9f89563115b079f6d9abb58ee13e22a4258424a2ab5d4cb8b0515dc17173a3e394ac5717f1c785362b9107cc7c0d0ce49871b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}