Sick leave (or paid sick days or sick pay) is paid time off from work that workers can use to stay home to address their health needs without losing pay. It differs from paid vacation time or time off
1. Compute SHA-256 of OTSCanonicalRecord value → must equal OTSHash 2. Open OTSProofURL → extract Bitcoin block number → must equal OTSBitcoinBlock 3. GET OTSBitcoinBlockVerifyURL → returns the Bitcoin block hash at height OTSBitcoinBlock; GET https://blockstream.info/api/block/{that hash} → its timestamp must match OTSTimestamp 4. Read CopyrightID inside OTSCanonicalRecord → must equal the CopyrightID above 5. GET OTSVerificationAPI → pre-computed 6-check result from server 6. If all match: this entity was registered on CopyrightChains at OTSTimestamp, independently verifiable on Bitcoin Note: an OTS proof may carry multiple Bitcoin attestations; OTSBitcoinBlock is the earliest confirmed one — a later attestation inside the proof corroborates it and is not a mismatch
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce335e0610328b91e1ec8f7b8df4c481604b0777b6fbe26da19d37918c39aef. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9b82d1ac-db97-4cb9-b5c0-ed37a4e58f84.json and https://artists.proofprofile.net/proofs/artist/9b82d1ac-db97-4cb9-b5c0-ed37a4e58f84.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.