{
  "manageEntity": {
    "action": "Save",
    "entityId": "1409238997",
    "entityType": "Track",
    "nonce": "0x216eac37815dd8dba47b721c3d5bfbdce6eda8839deac32a3808b8a12a301df4",
    "signature": "0x01db760d818659876da435b7a6cd397eb17fe028a179b1c8c0a2fecce61d59f3317ff473e2fa1063bd501aec11b552c2183fa40d2c85eea0cbaf4ef3704d41f71b",
    "signer": "0x40aE1C539711FBaE3930131b028D9c764fD8EaCb",
    "userId": "35251"
  }
}