A djembe or jembe ( ; from Malinke jembe , N'Ko: ) is a rope-tuned, skin-covered goblet drum played with bare hands from the Sabar family, originally from Senegal that is widely used in West Africa.
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 0x185d4dd2be3d1b7f71a7dd921416bd39d80773210c5255d3bf5b70f0c07400b0. Chain 2 (Bitcoin): anchored in block 953803 (2026-06-15T15:41:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e1d551f9-2813-4daf-ad4c-17629d17d14a.json and https://artists.proofprofile.net/proofs/artist/e1d551f9-2813-4daf-ad4c-17629d17d14a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).