{
"manageEntity": {
"action": "Save",
"entityId": "548719",
"entityType": "Track",
"nonce": "0x34145ed678ebe9579a2748c006e05b75046f6c98d877aa82a3aeb5c9ee43e9a3",
"signature": "0xf6168b8a05c58399053cf379be8755ba9bab8ac50ef32f14cd6e73678c198fd66f0b0f251c1e59c1c93345e690c28b6ee6e3e4faca7a3ac6f82cdc89c35018361c",
"signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
"userId": "386745392"
}
}