{
  "manageEntity": {
    "action": "Save",
    "entityId": "668164523",
    "entityType": "Track",
    "nonce": "0x28fa86b7b2aae8e02ab4ef402bd537341839b1b2daa27a80059f2d094ac7a91e",
    "signature": "0x38a899c7dcfb22759d94014bb23b7fdbc5b269e081ffa67ed60ea658873101a4220d52de3fe405f33f0df914a1e1d90fefe7c12859b3de76d2848186359852b61c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}