{
  "manageEntity": {
    "action": "Save",
    "entityId": "376553018",
    "entityType": "Track",
    "nonce": "0xc2559cdcb9ea62ef54dce40cddc0aec26dc03161f420ef2aaee017d6cadfb36b",
    "signature": "0xcc30da48d18617618d1eca64d66a48ad3a4d7e06dc58c28f2a4e9762131225d84390f4b93c8456cd95786cf8f450e63c979b830b76c44e42f9bb0c4a49867b6b1b",
    "signer": "0x7E7b9c4DAC3F284d889a5bc274eA80b8BA5F63ee",
    "userId": "670307808"
  }
}