{
  "manageEntity": {
    "action": "Save",
    "entityId": "637450452",
    "entityType": "Track",
    "nonce": "0xd2e0f920b122f1abe0ae08cf43db32227ad876aa375e4092507318f26eaec2fe",
    "signature": "0xbca0373e92ed3b60bd893242399516a3d4262482f9164eb5f3a716534587826f6335a0bce559936743bef55bd846cb45c42b157bdbe6d24b58fa1ac009326c0f1b",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}