{
  "manageEntity": {
    "action": "Save",
    "entityId": "485864",
    "entityType": "Track",
    "nonce": "0xde21122cb9ba485546b9044131a16657d89c8115fa2cd7ef74c82ce6b299f51d",
    "signature": "0x49285fa8bd7ce674f78f06e643cfbdf20038702b8304011ac35001e34a3596cf76b7e1e04da6c28fa8710f6ded9572e3f6b40e233b6c8c621a9f2ad1257117311b",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}