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 0x6f506a3b2709d459813391f056c71e609e8e99ddd1e33840242d46b6606bc936. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b82dc942-a1d3-4e52-a6c3-c60955ef0639.json and https://artists.proofprofile.net/proofs/artist/b82dc942-a1d3-4e52-a6c3-c60955ef0639.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 0x3488d8a2df5c1a20f9a3bd478f2abd5081824872f01f29ad34144f7fd683b279. Chain 2 (Bitcoin): anchored in block 958700 (2026-07-19T08:09:50Z), 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/USA560583777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82d4379e0b1c52a2814106eb80164f34d9a7463b4258ae8a8323b4ca30b9d594. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T07:10:48Z), 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/USA560583780.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f57c540975c7770df89a2bda70efde72c418ae6c1c6485c047333161a8462a5. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/USA560583783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x894474daab2f031ae011be2109b31e22bbfa90341ebfaf23ff3c3a88597bac7e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USA560583784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16629bc32a9fe91663ba38d9f480b6c05789248c1261c07bf3e462ff67c82e1d. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USA560583786.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab8fc6a41530de552d29bf7fe2ca1d7914baea7e318d448670da75d94bc6cd4e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USA560583804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeae1220d35fc49c1e8765e4b755aff52d78ee277c8960721f3fae2a5e19b4d3. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T02:56:41Z), 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/GBGXD0900034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc2b309cc45ec8662dbddb71b1d86dd5f5526ee8ba39ef46afa36b3a35462a5b. 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/GBGXD0900052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5d9430460ef238f7f81e3e93fb82f68ea61bc724a8d7e8bf9fe37b273594fdf. 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/GBGXD0900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a65019baa97d2d363af040d47b18c5941cbcb7de8c54f3b98b8652010a3c8ac. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/GBGXD0900079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89cca8c602bc82ff311f61302e66f06b52dffddc10b0df9296b7bcc9cd95277f. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/GBGXD0900091.
The Houghton Weavers Ultimate Collection
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12fe9d03c9a115ba5988317775cf246ec1c45f91e4a748d52ff4ae6ca636b17d. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/US6R21395089.
Golden Country: Best Of The Houghton Weavers
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e46d85403366a048cc2e30895ae7574bc1c16dc1c9869adbb38e603e3bd220. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/UKLJX2002102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x448bbf47ccf6b1c7aaa4c125c7734f01ebb4ffa10d4a3a955f4a7b32ebb29a5e. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/UKLJX2002318.