{
  "manageEntity": {
    "action": "Save",
    "entityId": "221405",
    "entityType": "Track",
    "nonce": "0xc78a0ccf967063cc211cf2f41d9c180f001a55afb406a0cc28f59dca529b74ba",
    "signature": "0xb8984565e09c0a537c8d33e7b865c559ad2e787a736a86e6e88f5072ccf2868a31a06ed1567d6b893f937961f4500cdfbbe70c4dacb561e05451a13aec67f2621b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}