{
  "manageEntity": {
    "action": "Save",
    "entityId": "678374618",
    "entityType": "Track",
    "nonce": "1787258386583018198",
    "signature": "0x2f58584761bb1e155b600649c94ab50cc84f5afd762262f68600eba6efdedda54a7bb2e3e046344a07036cd070af01a4780dccb0d0bad178cf87dbff312408a01c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}