{
  "manageEntity": {
    "action": "Save",
    "entityId": "333739283",
    "entityType": "Track",
    "nonce": "0x67981fad5d89150132ee557cc694ca0a4e1e9e1e6a5b10082f15cdeba8941ac1",
    "signature": "0x813a854470fad6d656db6108cc701fc0a10e369949ebb6ef5f7552f59dfa518c4c40ff68f8a0ade6860b178034108bd779b0edf00646df789e4e7e89fc4729a41b",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}