{
  "manageEntity": {
    "action": "Save",
    "entityId": "788265140",
    "entityType": "Track",
    "nonce": "0x7beb156f0f2b7766a07798a4de2a67d8f17d937ab6bfaad49203c490b11187a2",
    "signature": "0x5a862717e95d22187948c8413e2e04d0d11fa8a6ccc625805f4c21c156f01afa42a314059d2d0a91a78622e828aaf48b0ff646f4268baa95a0399388b9ba03af1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}