{
  "manageEntity": {
    "action": "Save",
    "entityId": "655895921",
    "entityType": "Track",
    "nonce": "0x5074647541c1ac84262bfece9980af2c291141a38c7656329744d923367a545d",
    "signature": "0x8d73baae2a945e250417e6dad6d2c30c63089ea6841ee780c2a87dc64f22eae9581c5898ecc29d3a9e10988b8c455a94c0c25649f2ff4877a09f163b246c45861c",
    "signer": "0x2BD0c2111290EB20B2843e8b1c0f25aA5cd52a6f",
    "userId": "618242981"
  }
}