{
  "manageEntity": {
    "action": "Save",
    "entityId": "472436696",
    "entityType": "Track",
    "nonce": "0xa921d298b35481dda795657710a6f2e59645d4734638a7fa1e69037b8ae21819",
    "signature": "0x0e02968f4c0e4d4cdb129caacae2c10e9b44d42492d9340684065fbad269ec872eb8919f07a787c78768aadafbc3e89fa0d80fb612cd4174275cc903ba6342431b",
    "signer": "0x866c9135AB994f6F3351c1ED8F1c3f8bA8eDDafE",
    "userId": "954104006"
  }
}