{
  "manageEntity": {
    "action": "Save",
    "entityId": "1720068307",
    "entityType": "Track",
    "nonce": "0x81b6a2ca793de9504b38768ff83495a500b6e6b7fc482d1163b277b58e64a845",
    "signature": "0x4f0804230e9c9eeb16632a7597fa1e68defc47eba98542dbf977c8c59f00abc81387f35371d4724352a44cd59f5d9255570f2ac7a3cf511b93139b88ba60c5b91c",
    "signer": "0x87FC3581f96D45b347BB39E15f25079950C5Cc27",
    "userId": "339826419"
  }
}