thumb|300px|High-quality tenements in the Hyndland residential area of Glasgow, built 1898–1910, links to Why Glasgow is the only place in the UK protecting its tenements thumb|300px|Tenements in the
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 0x73862a3f4e35705f478f401c781fb5fb746a070cd16eb1bff1c2d0901bd31df7. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fd38ddb7-987a-4086-8770-068cfbd01456.json and https://artists.proofprofile.net/proofs/artist/fd38ddb7-987a-4086-8770-068cfbd01456.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0x59d7c857bb176e6b7ca7fe057d02cd438401cb6572408f2f37f7edf56be401bd. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/USHM81130548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9dd944402d8230d5ab3b50ae35bb529f92774d1b61dcb717b39911210744cf0. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T21:12:42Z), 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/USHM81130552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a2cf7dfacd454bcc672f4487fcc31eb738322fb85d17d00a3991428a9994c98. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USA2B1512150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0f78df04a3ea71ccb8a26da0ae5417c9ef8e88cefab63d312c1109a1d346001. Chain 2 (Bitcoin): anchored in block 958571 (2026-07-18T15:39:25Z), 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/USA2B1512151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf69dba5d7ad78ed53221f26e625784f3770fc905f90102429f47c9eb83335214. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:12:28Z), 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/USA2B1512157.
Music Composed for the Motion Picture Smother Me in Hugs