{
  "manageEntity": {
    "action": "Save",
    "entityId": "1019755",
    "entityType": "Track",
    "nonce": "0x50329b7d0e66212e8b6a488e5bc7c2c19dcbaf496ed4e0887874a596e4d5c1e0",
    "signature": "0x2a0f2d5cf61316a141e798da2583e9af2135c7542d1786e623f23952610850ac639ccf11b54c6c286851ce049f4c54e639c669b1f16315557174be0ea1311bbb1c",
    "signer": "0x849b8180f084363b37768C823c174C9786020A66",
    "userId": "817339612"
  }
}