{
  "manageEntity": {
    "action": "Save",
    "entityId": "325853792",
    "entityType": "Track",
    "nonce": "1785684634174435842",
    "signature": "0x32935c6a7dfc160870b8d4abe8012320fad1e76e37e3db5c3b0b5e13d8035db43a251e257f4654c5322a60896145ec6dd0542178a46f7f0e8bb86959720275831b",
    "signer": "0xd30fAF377491796757Ef4C1B0ccA8a407920e663",
    "userId": "451691735"
  }
}