{
  "manageEntity": {
    "action": "Save",
    "entityId": "657575",
    "entityType": "Track",
    "nonce": "0x0532500a4da0661614feffb4b071469f011412d97d7e2a8dcb81ce70eb260e4d",
    "signature": "0xa6fcc9d4f47eeb86daa2b529ca478558bee6ef8a52ed2901f6bf60f42f3cb28b380d98cd8380bb4838a8597562be5b8d6bf8bf839d4a001c76fba12f08cad06b1c",
    "signer": "0x647204eDe2dcB8e40793BB48e4bb4Be7ab706de5",
    "userId": "580720856"
  }
}