{
  "manageEntity": {
    "action": "Save",
    "entityId": "1606832821",
    "entityType": "Track",
    "nonce": "0x7a1f6782922b1ff01471a3c27627451d4d9eae77473990da098747cd5dd6c79a",
    "signature": "0x5411cb9c82eaa47600ec1a1238f2a4c0380fda3964779da4bb60549b54d6fc440021e3c754032c872415a22c658fa66f50337e2638d6ce532396b37d0aaab1091b",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}