{
  "manageEntity": {
    "action": "Save",
    "entityId": "574846951",
    "entityType": "Track",
    "nonce": "0xf09c315fcc5be049b6d40d10711e42b35decd6fa7414d29a51a6813911da5e66",
    "signature": "0x90924c29aebf1cda4951f679b6902ee0045445f09875b0d4579d229212383e5d7847913e15b908dba31de62846179d247c402f3e73524209b827bd8c000211db1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}