{
  "manageEntity": {
    "action": "Save",
    "entityId": "1554868135",
    "entityType": "Track",
    "nonce": "0x0d75868452aa9528c8c123dcb8c84382beb4e0fe0225a88e5bb21696db49755c",
    "signature": "0x0f52b065b655e8caaf663361e6bef95e2785da55211cbe1b5c69a6b8ff2584f0570b68f14aa56c51c03053bf938376e6a83a90166df9ef40decf70cd881e89b41b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}