Buug, officially the Municipality of Buug (; Chavacano: Municipalidad de Buug; Maguindanaon: Inged nu Buug; ), is a municipality in the province of Zamboanga Sibugay, Philippines. According to the 202
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ec81542bf84e590ed9aa5a8ef8cf22e9391e8ddab4d1304cbfe143a98946e55. Chain 2 (Bitcoin): anchored in block 954618 (2026-06-20T23:05:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/c972d38d-5576-48c2-9d92-128d8ced1140.json and https://artists.proofprofile.net/proofs/artist/c972d38d-5576-48c2-9d92-128d8ced1140.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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1. Confirm isrcCode identifies the recording in the pre-2022 source corpus and cc-db-prod record 2. GET OTSVerificationAPI → server-side canonical-record, hash, and attestation checks must pass 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. Confirm CopyrightID is the CopyrightChains transaction hash 5. If all match: the cc-db-prod record is independently anchored on Bitcoin at OTSTimestamp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b46d3673742759f1a0070dfb0e388553707a964f3ecd3ee5000e1a2572a3ce1. Chain 2 (Bitcoin): anchored in block 958368 (2026-07-17T05:03:25Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6Q2562408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x387dd5ccc6a5735415b8fcec70fb5ecfc81a0c15cc54f82f75a32b746620d33d. Chain 2 (Bitcoin): anchored in block 958633 (2026-07-19T00:54:50Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZMEQ2560515.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57308ce625f932902a509bf41101e51327789fc02d1b32c52dbd85b59557c415. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWQ2548463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab4411c73ffa5b9e2f9005d15fb3968a65df7bf7f7c51b141bf03dc16a79f83b. Chain 2 (Bitcoin): anchored in block 958612 (2026-07-18T21:29:37Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZNWR2574418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9fa5ff3b25ac3070cac3aa553866865f0656e16821ae93f50ed840f4bf7ad25. Chain 2 (Bitcoin): anchored in block 958765 (2026-07-19T20:20:10Z), registered by our registry partner. The server verifies the private canonical record against OTSHash without exposing internal provider keys. Confirm the public ISRC, CopyrightID, and Bitcoin evidence via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZTB52540070.