{
  "manageEntity": {
    "action": "Save",
    "entityId": "740846241",
    "entityType": "Track",
    "nonce": "0xbfa1dc2a09e4e7a7d5ecbb5eee1a42e0d4a81b004751c2913f45e9e8675021f2",
    "signature": "0x44317c6e524282a07b3c47bcbecff3dfb83d620ce92ec76e64fec65f3a5f162b6b4048d2fe5e04ca93a31d966bf39ef4707e3242672b97dd47c338f2eea10e3c1b",
    "signer": "0x243A439c272133AEEE0073AF4986dE391C430866",
    "userId": "77551267"
  }
}