right|250px|thumb|Wooden loom in Lesbos, Greece. thumb|A treadle-driven Hattersley & Sons Domestic Loom, built under licence in 1893, in Keighley, Yorkshire. This loom has a flying shuttle and automa
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 0x01ad73a2f6a21cf3643d21e0bb073cd3f93056dbb8878bae4d73df441f036538. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5deaa1c9-ce96-48ec-9fab-33d66da81f4c.json and https://artists.proofprofile.net/proofs/artist/5deaa1c9-ce96-48ec-9fab-33d66da81f4c.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 0xd542c40984dd89f200528519cf02126af893d69c12b8751714fb94408907db70. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/GBKQU1729941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8448103dda369d3e321fade241f59664506374bcad3a7276c687e7333d2c27d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/GBKQU2141419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x956c5ba9d8c098ca3f596f2b8926c58c68b55a5b9db9f429de125171f5e4bea7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU2011148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9fe657690877c7fffbc74e242b9e41ac3b9a38c413ae872d63d6dea0560272. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU1933854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0da1aeaed212b513bbcaa7e224b9a591122866802d724bda0d2582d97700a5. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU1933855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7209d6dd0b5a92df52f2667f86657081c960392599f22ec8bde1a6d0c6c2297e. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/GBKQU1933856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ca344acccba82eda939c8ea902108ddb9ed4cdb451365ec0730b7e7bbde72e. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/GBKQU1933860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc20c94dc3d2372a374f66196e3caed180976daaade42acc10e47c24d22c6a25d. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBKQU1933862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0483af1040448348441de66ced0df268a2974708adf4ec49b055f53200775cb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/GBKQU1784363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0a5b2e3ce6df178d695a7eb98e41090db1bd6278cc5a950836842381b077120. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:06:22Z), 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/CH6542368147.
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 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 0x39074f9178f53a18a49366a6c9341aba8510b3be92aec9024de604e80152fa38. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/GBKQU2149161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2115e65ba7be579e96484c8efd2a0ed1c1035730d40977ad734e14420b8c7b5b. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBKQU1829609.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45475e48241245bd3506724fa5ff5ea593a12b1bde450770ee6807078ab2868f. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GBKQU1933857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae281a03d31ea8320b2b04a162104163fea7961cb5cc1b1c670f4b25582736ab. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/GBKQU1933858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d1b10c4d00d0a624e59791d0a2f106974221d0d5dfa44664a22057bdfec633. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU1933859.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa9437a0269b0023a73bacefb3c6a601be88c2b0ba1107de139bae8f4503449c0. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/GBKQU1933861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a39b4fba5e84111b3d806efabf2663579754f7684e2235d65326001233d42bc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBKQU1933863.