{
  "manageEntity": {
    "action": "Save",
    "entityId": "248844727",
    "entityType": "Track",
    "nonce": "0x686963c5bf00a1ce48e15a734f91b58f3560d0e5dc94b1eeda85e86ff8d2d90d",
    "signature": "0xad08a2c8bcaac2ec494a97680b773155b8d696ea7dc76cc63b5c6af2c3ef8dd57b833bbc527c86a17789bd340d436767a9e58a4aab9c4c937a4a6598be4eaa341b",
    "signer": "0xA66d5981794A5e084FBD9adBFF28F465924fb9a9",
    "userId": "980224167"
  }
}