{
  "manageEntity": {
    "action": "Save",
    "entityId": "254538701",
    "entityType": "Track",
    "nonce": "0xefe34b98468d1b4459445e6f372060472e6c1114beb16203e30d0c4eb069b18b",
    "signature": "0x8c5431877ecf64de5a68019d99f116f6f99f6f5bfd46d2c764afc89a41750d9d35a993a4c5bbc8a94987194514555fc0ef771ada93e65ce1f1a98f8feed8858a1b",
    "signer": "0xA5fFfA5b8673Fb93490E3F9B0BeE58e1f0Ce1231",
    "userId": "508186998"
  }
}