{
  "manageEntity": {
    "action": "Save",
    "entityId": "148734650",
    "entityType": "Track",
    "nonce": "0x596ab99b3ca2259e70912912cd520b1f5cbdf9f7aa568d7abcc0d34b1561dfaa",
    "signature": "0x417fa737a00527d28c51f6ad01d9f7425cd2d0b61ee222b4fb2ff4d9bf4eebc71a8d97c9c6123487b29146b42780c0bda83dbf35e88d86d4be7e16e15c5318aa1c",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}