{
  "manageEntity": {
    "action": "Save",
    "entityId": "1689131571",
    "entityType": "Track",
    "nonce": "0x5879f33032ccaaed74f741d282fe71436c60a56f8794e82f36fad3ad8a807fc0",
    "signature": "0xd72cd78c1ba804de93af0be4b5e8f803c5602440b6ba2023a5736b63a551896b2896f6c746e5dc81e4991f17d3ba9c5f1aa2d255a059a48528791105f57133a81c",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}