{
  "manageEntity": {
    "action": "Save",
    "entityId": "890152791",
    "entityType": "Track",
    "nonce": "0x975e980959fb90be173bab06901fd1d4cb31c1bc17683b6f209544c885812c06",
    "signature": "0x8bebd86eb75213c4f271370688accc7e1367f0ecdd4b4daed70ccf7b17472e485dd990b6442dcb8526bba4cb0fd32caea1c5ce42ef4fba37e7c4b12f3a1f3b131b",
    "signer": "0xE7D37531a757aEaf8B2c8037a79C03819edc20Dc",
    "userId": "870684573"
  }
}