{
  "manageEntity": {
    "action": "Save",
    "entityId": "667030397",
    "entityType": "Track",
    "nonce": "0x7bd262e644d94d4d3747b8cff78bd5458ac26339f830e766dd7409d9b5dca3f8",
    "signature": "0x390427a5115ac85c19ed0dfb4f62be24083b7eee6fd8d43ae4e2b73b55c6e4c33a48cf3d6dec551d8254709cf463646e5e43800cb86365d44f900757d6e8473e1b",
    "signer": "0x481d41B4b34069e19EDC206C160447ebA0841f6F",
    "userId": "854614078"
  }
}