{
  "manageEntity": {
    "action": "Save",
    "entityId": "671711072",
    "entityType": "Track",
    "nonce": "0xae3a327d7f6c79975b4d2370f784bd2cdb03734267a3f2dfe3af0a4d5a48b0c4",
    "signature": "0x781e00983d5d5509b0705843041201ababbeaf1d8d0a03af6e09546febc0989b7785007f0a1d3408b9f75eecf58d5cdcf2108c0f98cb50bd2f1d37e4dad43a931b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}