{
  "manageEntity": {
    "action": "Save",
    "entityId": "128410643",
    "entityType": "Track",
    "nonce": "1793005065198387223",
    "signature": "0x0f2a789f929f83ef2302ac172bd64515222787548e8cda5a01e9f67396ebc483181b4184e4ecb832c76aace1acd5fa930b6d102e1a5e53a556c3590ac70cf99d1c",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}