right|200px|thumb|Ingemar Johansson knocks Floyd Patterson out, becoming boxing heavyweight champion of the world, on June 26, 1959. right|200px|thumb|A heavy blow to the head is a frequent cause of a
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 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 0x26f61845b59ebd789c26377dc7296b1ff70cda1ad2596cd712f7ed169da45eaf. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/076b9015-d103-4bfe-b553-d65397ab43a1.json and https://artists.proofprofile.net/proofs/artist/076b9015-d103-4bfe-b553-d65397ab43a1.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 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 0x7ffb06ef7f1f50516ed572f6ceda618d119a1660055be064d4fc2ebe6732ef1f. 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/GBSMU5629599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c35beb763f3a749bc738aac2ad7b563559be429a6712509d4fb9cddf283673. 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/GBSMU5629600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3e1ca40b8a48b817c77ac426eaff697ab09332ac8a21524b7e4e543f977144d. 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/GBSMU5629601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bee8860e8419fb88ebdaa7f83c472850872f8aa8567ea609c31fe337552866c. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/GBSMU5629602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x555223e0c63dbfa960f568e6b0294cd36fe8e61929a0ec3c8805d5fe5a000e0d. 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/GBSMU5629603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb40af9f8a8e32cbef4befd6314b551d4f3435882e193d1daf68a85e5589f9f21. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/GBSMU5629604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b482c026df886d09f46ef345f54d01a47068f64104af4b87aa9600085e5e98. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/GBSMU5629606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfe4fc21e93d971fed3aea26e0504ce5fbb70cea17b4bc51145ea5c02fa5e78. 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/GBSMU5629321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83941ba135991f983d40ee304c18ce9e3425d0d5a1d4b9ec07f367eaabcda65e. 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/GBSMU5629322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45571dd113f2d3ef387bdbe5ca54387a500fca3afff8ce2f370841bf89f18802. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/GBSMU5629323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0485d67a640b578b0eb235c5e316ed4b835f335dcf53dbb3f8c24efaad73fbd. 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/GBSMU5629324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbc94d220c1919eec5b1bcdcf9a1f98f3663fed182ff6ba33403e9d6f4eaef12. 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/GBSMU5629325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67800e6aac0f9f13898e1dc73ca5a3adac74397ac306d7479f8684ffe0b90fb2. 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/GBSMU5629326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f4b54640af163927b06b55f2cf13f8296c7bad86ffc3f250e072cae42ce185. 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/GBSMU5629327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd677bfcf2bc82a3fd34cdcf30c88204d09507bc5616acbe9c0cdedd444207f07. 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/GBSMU5629328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0488ec555c4d7504339c3249374ae05c3e0e019269a7d9fd5d2894e277aca97c. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/GBSMU5629329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb631c4f131f820e313f1c5a88007522bc6796afa28e460ab7c669c4b782ea5a4. 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/GX3HH2476449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe11cd4e984c5f3e17d4c7b5c04b658c95ed77a228a24efdfb2b62e60c2446c18. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/GX3HH2427047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda172c613a7201e7f1c35905057c02a44f3fdfe885650c1a855d3afbb5d534c. 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/GX3HH2453272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b99df5c0f76bb352a30067b2adb19c271921c812cc878b26b1f503697e6b167. 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/GX3HH2496391.