{
  "manageEntity": {
    "action": "Save",
    "entityId": "898259939",
    "entityType": "Track",
    "nonce": "0x1da7f2a02726be3ccf1dec4f66bc6ae4027cfb222857d0b309e4bc55e30a76db",
    "signature": "0x2c1bf51527b42c78faf1e0ba5c23b98c22acf3967cd82d86692a268e1d5523dd27d53fc9f212e78a63667b4e63c2d531b454bcd9cd450cd9cc997083e4ef575f1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}