thumb|An ant inside Baltic amber thumb|right|Unpolished amber stones Amber is fossilized tree resin. It has been appreciated for its color (orange, brown and, sometimes, red) and natural beauty since
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 0xb11c70665b63ee879080551986be663bc2ade9f6ebd1a7768cfbf19c01937de1. 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/f3cd9f9c-5ec1-4d81-b8a3-29b510b77648.json and https://artists.proofprofile.net/proofs/artist/f3cd9f9c-5ec1-4d81-b8a3-29b510b77648.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 0xb6df6573366de99b9281b749b4a0a60ea603dd866992f61ed5d18606d6229ccb. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/INB942401694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde2aed695ed4b4f60c55e24701313d8a20d49bfb09c07dee3847d0c365e2271. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/DGA082465342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b78c3409b4348ef0c0575782c9f4897a4038b3497fc2b6b9decf237d65987da. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/US38Y2409372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b6b6a5d0861a5f4cf7cb008961504e43cbd48afd1e718865d616728867523e4. 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/US38Y2409373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03d5dd8cd922657908c6102772d9a59b128eb216f41684ef85c111f98df8819f. 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/US38Y2409374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b6b804fb5ecb6e5b77128f8304745adde6eb37a1e31c33e1c2c091b92024b1. 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/US38Y2409375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88b8479b07977ae914d70bf551bea4c7c5336d2fd5d96cec714efaec5fcaebcc. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/FR10S2481640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8be87a45bf4185a944c87ad0aa93f0c1d58ad4e2c44385e9c7718d96a7b59589. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/INU252412088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x561195ca2911c90f743722b0471367a83a2de0bb7ab0bb9c083582a4f01e3238. 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/ZA41S2405409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68507909edaf88894a81f65f534b575f5ebaa8f18828f9b80de56051cc150ea3. 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/ZA41S2405410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e9561cb2d930e874c8d60ebad8027606342e26b77383ea70ffe4dae93595d79. 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/ZA41S2405411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc0b4a34f5697e4bb9f82b517d19a7f47eae8c0f34514ee0973a131061e1841. 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/ZA41S2405412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8afb0b63f93ab4f3d0c5bb775aeed30e5f097cb4c52afdd30d42ed339f14039. 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/INB942362040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f987f80a914da73882d1300e9e8a666160a783fde04ea70c42f7ca0d7ef4e77. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/INB942361962.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6439d752c341962aee94e15abbbbc6af660f6111186642aad3e981f8b3abbca. 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/FR10S2303649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45054385243bb173c2cc76cfdfdc9febd5163737b9a69c855dddb6d97f7bd173. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INB942204306.