thumb|A thimble thumb| (Thimblemaker) from by Jost Amman, 1568 A thimble is a small pitted cup worn on the finger that protects it from being pricked or poked by a needle while sewing. The Old Engli
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 0xdf342d4f94d06a65ea03deb14a9c5e493498137fa746d6eca289ae2a402b536a. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe41af4a-b0d3-4799-ac14-aa33f483629b.json and https://artists.proofprofile.net/proofs/artist/fe41af4a-b0d3-4799-ac14-aa33f483629b.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 0x35b0bbd86ee8325faba79c4e3b733ebc7ef377811baaabf68cdb42f4154cfda7. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEXO42257343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1f0a0bb106cbc3df0e09120b8a51b0ec7e917272a66ddc2c0e6536e132a7f32. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QM4TX2451411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc52d7c5db7e0849edc006fb7136e7a9c48fdb707399af19a46cfb00a2b9525cf. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-21T17:32:37Z), 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/FR59R2484695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0563fa11dc53f3e8fa6241006bf366abd5ca8f13efd8ddaa8bf952b1aaa9f899. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/US83Z2462332.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e0b0f73190c937fd4758f6b33fb8a5070a6cce73fb371c58dc83ab22ec4956b. 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/DEY472378975.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x424019508d549b260fe405c6f0f028cf037468ec120f4afcc365fbf4026ca912. 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/DEY472378976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd67cc067107deecd0456176466eeba1b3e02e2e64b0be29bc9f18c8fa622da19. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/DEEC33501080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0315316d56a690c22608293832f36b72bb94f9644bfd0995acd0eede116cc834. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ITFGO2300041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x232e63bd53e9b8c1f46e76f5721ca4acab19b709317db53c3fbb764c1b3e3f50. 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/DET752100087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x340e8b96df8794c77d1d21989c82144c6743b8d733be8192adedf3fdc56e866d. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/DEG932102841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5c877d13ea47c459efbe206f2897772aeab785ff20e1fed445b0dcec5a78828. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FR96X1981275.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb081d5ecf02e4b50b5aa36c4c35457e7319ae9b7d27b52cb491a712cbd813511. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEEC31810576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d8b59c0076bc38edbdee3b52e577d5504d9a5af9556ffa70f4c9ee1125c817b. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEEC31810577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba82adfc09c5a10700dbaffbf3953b9cab336af15fea10147c8983e52bb8159a. 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/DEEC31810578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23b53ca5ea93933f715efb64ca95357055fa20750b0bd0eb3f32285ec9cae67e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/DEY472570691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca1d025756d47559110429fc26b822ba771a9f1e0c322471e49d596cd8b26a8. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/DEY472480379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f388d86569828e34764fd3e40ec9aacc772cacd01e8b5e88fd2b486f36dd6ba. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/DEEC33501678.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba1f25b43b111cd09c7366d076c3607a5743b049176982ef4933f1582679362. 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/DEEC33501679.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f16d93666e4f0faa082236f8329a03721e237b3c668e4570096e98dbc54b58b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/DEEC33501680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b0bbd86ee8325faba79c4e3b733ebc7ef377811baaabf68cdb42f4154cfda7. 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/DEXO42257343.