{
  "manageEntity": {
    "action": "Save",
    "entityId": "493097",
    "entityType": "Track",
    "nonce": "0x3681726c8cf1074c32a566c0003e27ac966a91bd2414f4c4fa6e1b66be798084",
    "signature": "0x2df85ab4f67aad7904c7489e3ba7e786fabee6493fab2d25a159f231cdf3d25b35439c3e10193a9e3d2653df61b089544d9366c89f31cf8ad2c47deb37e0033e1c",
    "signer": "0x43dA66b40816c8fb9e2B0AA77E0643192169AF14",
    "userId": "636236864"
  }
}