{
  "manageEntity": {
    "action": "Save",
    "entityId": "298096905",
    "entityType": "Track",
    "nonce": "0x42832f49a34675999c99dad6db57f92b5d3c3b1c1272894e18a0530150ae06ef",
    "signature": "0x723e57a2c521c56f1a5519952cb053976cb975e24c299041d1941d3f969a908d3e72ed2e86cb2fb77e06ae39e0037b8d283806048da48f0a24aee75a35ae5c211b",
    "signer": "0x58501cE232db1f85664761410c7F8FD055342AF7",
    "userId": "123836"
  }
}