{
  "manageEntity": {
    "action": "Save",
    "entityId": "423427463",
    "entityType": "Track",
    "nonce": "0x2f63101bec784f57fcc9d9aa2ebf9e1fcce95693df9c41533c10005a53472ca1",
    "signature": "0xb86e070e19a30a708904f23f1abd1ff02299eb7b45506099bbe098a4a3abb4e44f4b7534403a04429d1060b2dcfaa2881fbfe564c8a373fd850752e86db2380a1b",
    "signer": "0xF7628Ea36C0C266E289b7538b033fB949A6C31ff",
    "userId": "386745392"
  }
}