{
  "manageEntity": {
    "action": "Save",
    "entityId": "1639458812",
    "entityType": "Track",
    "nonce": "0xec3c33211f5bc75ce7dfb908020eb3cd666bccfc7d8c33e45f7709262a5c8303",
    "signature": "0x8f56ebbb5653dd038ff1e6c50965c64a586281483d52120da0f35cd8fb72c6963c39c3e2aaef2128a3ded548998985cfe5350b107f5136517c2950cf7b173b011c",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}