{
  "manageEntity": {
    "action": "Save",
    "entityId": "845210230",
    "entityType": "Track",
    "nonce": "0x4915ff04609f1b472e970f6710a909d87be8860c12bd2dbf7012be35dac4af9d",
    "signature": "0x56c73464d0671d56a8a1b4fcced7ed775897783b010736ae258ccb6e80c621b74561a2d9c5c6e0f66f2cb3ba9c246d3b1870300f4eadfb9460b1a99ed30dc9a41c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}