{
  "manageEntity": {
    "action": "Save",
    "entityId": "638957599",
    "entityType": "Track",
    "nonce": "0x79f8fd11e2df8bab4af0af83bd2dd6a8453c5ad0371e8a5d197ad2a9135d1e9d",
    "signature": "0xf6fa19ef3353e4de71d3a9c96af432b6de1d4157b39fd1d1135db4160869cbfa13ab2998772fa030c08e5fd0e6517f66c3c2c9a1ab5283319bce977bb9a160641c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}