{
  "manageEntity": {
    "action": "Save",
    "entityId": "1875401586",
    "entityType": "Track",
    "nonce": "0x9f23c68fa73f80df4e08ca7aa7dfbc98410b166bf79efe4c548a755f77998f9a",
    "signature": "0xc789ce5c6946e52d286f9b7da825fea3be64c4f71cbcc5d9d3a3e34bd59dd86c50223b2851c26d062f3d13f3f7a678ce90168ab475fa5dee69fc6e98eb0785e81c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}