{
  "manageEntity": {
    "action": "Save",
    "entityId": "532557686",
    "entityType": "Track",
    "nonce": "0x0bbcc87c24ee07023513e419501895dd4c4642b05b6c7b2a2de045fba781e8a0",
    "signature": "0xbcdcb987a0cb5ed6cbbc72408b4a5662adec78b4e89e8eaa0d3d74c77fa88d4b00a3575b4c52b4430e5328b451c3271e9c5af9c6fdf2909e7682c51e012042501b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}