{
  "manageEntity": {
    "action": "Save",
    "entityId": "646532",
    "entityType": "Track",
    "nonce": "0x4cec37877c401b3be5b58cf5096c32480d02e23cfe28bdb7d7b5020928b686b2",
    "signature": "0x7b56bbfaca7cf91fd37ec3e3cd4987f4a18c5975d5e71872ba97c0d4fe8fcd8e3c2a77714be710af8996b6e30579a0b085d8ea521ec66c11c9d6a3e5706322e81c",
    "signer": "0x283a6Fd0bE176865B404dfc3B2805D3a2701d62e",
    "userId": "484365174"
  }
}