{
  "manageEntity": {
    "action": "Save",
    "entityId": "659448067",
    "entityType": "Track",
    "nonce": "0x781ab87cc83842900c559694a3e46143f84b99d1f540beb08f51829099cc5256",
    "signature": "0x5c2065be1652ef53ab6b0106adec6f3c1aad9fb4981d2e3516295debe90e491578e9458cde7f85317145cd7c4a72e6f9220bb109319b50e4ac11c0d3b051e7931b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}