{
  "manageEntity": {
    "action": "Save",
    "entityId": "533899",
    "entityType": "Track",
    "nonce": "0x3eea835e16e44f07a272e4a5c6a4a59ddee87bdb56c86419cc460ae78fb747be",
    "signature": "0xef43942576cbd754e17d70102272f51b18e939ef602e3c5d3fb2a4fad4a9ec9d444395ba87711a2d9138b6dad33798c6477340daaeee52510b5776e3758509cb1b",
    "signer": "0xa2DaB1ebF6D10325b0948C994b592F7abB2Df44C",
    "userId": "728570067"
  }
}