{
  "manageEntity": {
    "action": "Save",
    "entityId": "388913",
    "entityType": "Track",
    "nonce": "0xb770a3b0905fdae592247fd34d06f8b77c7f9bcb946e3639b59924c46b53a3d9",
    "signature": "0x4a7a271598a55a38f4be6c78c330ae9831f1e4aa54a4786bd0a7afba586599e504b28e1339e32b040c6be892dd12828273a9115eff57ad099a864f155e38b1bb1c",
    "signer": "0x6068Da6B0a791A756931bE32de98D46eBb95890c",
    "userId": "475275462"
  }
}