{
  "manageEntity": {
    "action": "Save",
    "entityId": "726905273",
    "entityType": "Track",
    "nonce": "0x37a8de55352baa06542cfa06f7dabb411526440d6835e81218b0fd0b8201a2ad",
    "signature": "0x69ac68186e95bceeccb2c6a2c3109398d349b016fcf4c3adddd1d46d38c74d20296b441ed93fbb6f8df581484722be29975839c71989923c2f34e08a8b603e621c",
    "signer": "0x4D8EDeF47b57f98c89BDFf851267B0327BE4cD05",
    "userId": "5307724"
  }
}