{
  "manageEntity": {
    "action": "Save",
    "entityId": "1416603629",
    "entityType": "Track",
    "nonce": "0x5fa1842072cde6a17c434a34c315fe3b397d350e54a6853e689a94839bf71d18",
    "signature": "0xf715b17348f5e087f6e2f88f0e1b11ad09266a1d3a358a07487f313f55ecc624657358477f59fb0200a2bacfd1744dd8a396feafe1ff81824dde7184fbeb2e2a1b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}