{
  "manageEntity": {
    "action": "Save",
    "entityId": "1780684763",
    "entityType": "Track",
    "nonce": "0x49fa356ac1667124e00d13c61b963c046ca495ca41dd14c1d26f2b2d9fb901c7",
    "signature": "0xe8db3946a990960730d4e2563e578bce6579eff994b9fd902a93f0cf37a0fedf35c3995b74c5f10f557c0ddb009b9407016d95f41aa676b4e30326b7dfe807a81c",
    "signer": "0x1F9dC682fadBAc94c0Dd4ca2232a3f490704a737",
    "userId": "737872723"
  }
}