{
  "manageEntity": {
    "action": "Save",
    "entityId": "420927904",
    "entityType": "Track",
    "nonce": "0x72ef5a5c60ecb2c5f612f445a05c7abbe1aec9e03e7c317aa09b2133d21d4e9a",
    "signature": "0xd3e606541b0b79b274fff28799ed1c0dc49a1cfcecbc6ef65e80d99889ad18117bfa2cf25ee982ef2d3da7d762115d116acad59b7eac65a8fd24ca9993ca0b021b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}