{
  "manageEntity": {
    "action": "Save",
    "entityId": "724455",
    "entityType": "Track",
    "nonce": "0x6f1c664656a5a3e2489155eb034609219725cf875662165950c27972e36e24e7",
    "signature": "0x5ddc483bd6f5e2303f91d8f4194a81952e6e1530112c1065a38784536c56f01f41a7ea929271895f2f754676b4ed86c2e079e6344ea9839d805cd006b7b958251b",
    "signer": "0xbF4F1f4df4779768AfE75515b1552a2Bc5b4Dd32",
    "userId": "100976759"
  }
}