{
  "manageEntity": {
    "action": "Save",
    "entityId": "521978499",
    "entityType": "Track",
    "nonce": "0x8d26dc7e8803181367daa6b3d98782b949a2906943e0428c4f69cfdaae9f1f6d",
    "signature": "0xf96c3219ee6ebfdffe8362ee31f200163f121741f03b0dee027fc2f311c8c5c14a9088ab967e0738f375f3d6a7a674b19702b65521c69a5b19fd71776c6232d61c",
    "signer": "0xDC5D8e6d43489811098d4d3D31fB7D6585c9Bb31",
    "userId": "735980234"
  }
}