{
  "manageEntity": {
    "action": "Save",
    "entityId": "669212263",
    "entityType": "Track",
    "nonce": "0x973c4a7b92297a668e7fbf6d04f2694081eea3168b3f9b2ba73e842e112e385d",
    "signature": "0xc477ccf3783bae66a81549f039fc8f1bd360bab16fd39b95f1a748b42d6f0f6247a78ca9b49266961bbb9518c10e7d70129fdcb3b078611f1f2acd30689f90d71b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}