{
  "manageEntity": {
    "action": "Save",
    "entityId": "1492103290",
    "entityType": "Track",
    "nonce": "1785420728701923823",
    "signature": "0x5806040f0e8f29c63b30fa5b5561d9c3bda90df6fc3b431c93d47e3f9e2aacb4481124f496d2744a6ab8f4f89d3f28a6ca8ea5e38023c351d60f0b5a355d02b81b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}