{
  "manageEntity": {
    "action": "Save",
    "entityId": "1374087927",
    "entityType": "Track",
    "nonce": "0x22c917a48a879609da8c5dc1d571b0ce3424cefe14dfb506dff8a49b31a81cdd",
    "signature": "0xc0709839c901ea90a3337d05cd8ad73b7eac5aa27aef387d9d4170cea4299712782c44087c5f4970dce63f1b98112e80f9154fe400bade38a2dab9e68e9e221e1b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}