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 0xafeadeb01042686c9f9f6ec75da033e28c52c5fbeaad3fa099bc2f96d4971ff9. 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/c3334a6e-517a-4624-8295-add9152db195.json and https://artists.proofprofile.net/proofs/artist/c3334a6e-517a-4624-8295-add9152db195.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 0x2a6f73c90bb8c2ad7be9d6ff2ff4ffccd4bd9f97b127eccd0671ec20f9ce3c64. 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/NLQ8D2200029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeec007dfb9fb53ead8ffd612aa7a7c9323ef0172ecd5d5ca1c8b6ba1f027c598. 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/NLQ8D2200041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c52817c7b906af407181dd958457347574c792cb58124630e0fabdacbc3e4d6. 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/NL5UG2300048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7560b5caec549e841a54cc8e7d2ab7d87dba9957f0704bfe78351d3709cd89f7. 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/NL4VT2100330.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40b509f3293f0e530fe3714758a7cd4a3f5cf58c92bb875395dabc3ac202f08e. 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/GBKQU2378776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b52e29e58f3c206de9df534dd3385366148285d4122e03dd3e30b963967ba3c. 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/NL4VT2100286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb57a5bc98299553238c94fa3c307154dcb92add11b4d8f702311428426144850. 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/NLD682300861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x524ec3e65fb63f540e03932706b587b2bb0b13db2b71079782e91c61de63b837. 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/NLQ8D2300413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4f1f26cc2686de2c0b213caa22dfc7c2447b0b3190c57b16e4e5c1188a2947. 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/NL4VT2100232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97813c6abc5512c08180bfb70a01dbfeb8947d71fb0462a1532a00ccd99dfa59. 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/NLD682201727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ec751aefe447e1607ffbdbe4f600c303e2ba4d5dbe835b5962fa9b4cd863756. 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/NLQ8D2200270.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfffd6768cbbd9ac9130b730162c426fc0e723c29fa699e9464a1287dbbe5ca1. 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/BEIW12200046.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x127c97666d99dfc551592deae4692d02b6664d03f674973b39f99b742e7aff4f. 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/NLD682102683.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1aa72442c34b51b08a964a4c86cbfd938d7ee4e74769eb6d8a5d7ca608a5bf9. 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/NLD682102458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb04bdc3cbed7969e8c4ea00bf9cad22c0dad413eaac9eb736884b36946935d24. 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/BEIW12300703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0bf25c7110ef361cddb1cfeccf83bb857fbd6e2e0a812e6e9d359bb972829d. 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/NLQ8D2400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2df82bff317ef5ade6b3001ba372090e75a6ca206c05aaee3ae23bce31139bd5. 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/NL4VT2100372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ef9b7e6e7e4d54ec2c2c5bf493c582a4d251c743a1f520fea7bbff2fbbd2e6. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/NLD682401180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6efd43f997caf99b23f5aa431dbddacf99d98ef69660fd65368f19ba7f8090. 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/QZP7F2115235.