{
  "manageEntity": {
    "action": "Save",
    "entityId": "1172888683",
    "entityType": "Track",
    "nonce": "0x6b9404bcae73d740840bf5e75c2d47b2510656d1c710119115d68a974e3defe1",
    "signature": "0x5c1db8c98fd87fc6151503ee85313159245972a581ade120295474eaae2a272431693660b51be4111dd21db799f5073d7cb28fddfbe5922fca8279a6011f8c681b",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}