{
  "manageEntity": {
    "action": "Save",
    "entityId": "421086",
    "entityType": "Track",
    "nonce": "0x43f8c339c7289240395349178fb51e60d7ed1222aa2be6dffc37ebb0c48ca63c",
    "signature": "0xcb3d482ced59c6a27b06528e63a9dad2cd9f200d83055c2c6298ead1d0b47f4c3a6509d869fc1fa3275cfc1ef59a04f1e4ac2e653b5aabaf8cb4baa3032bec421c",
    "signer": "0xA27B00F57fC7B3E81c4d7C4919aCec97E1fCf667",
    "userId": "329513359"
  }
}