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 0x164965a617ecaa57e89414486e9f2d8a2c26e01b39a83fb01dd23024064d6b26. 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/fcfeea63-f987-466a-91fd-14a22484f8fc.json and https://artists.proofprofile.net/proofs/artist/fcfeea63-f987-466a-91fd-14a22484f8fc.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 0xba041fcbc2eed05925dea70cfbb28921f385ca9d632f4db650c251d3a4efc5db. 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/QZHN82029172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd672d589cf9104d65837fb85132fc76972aec6c8cba7d0ee05848e27a7236a3f. 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/QZK6K2060254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c5f1891bc4fd712d1e72c4276fe909dc80c628b3cd25fea2a29e37c50adec7b. 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/QZK6K2060255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a745ec8aeb3f02ded41d437781d0b4025f110f1ffe7e9064b7077212dd8db91. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/QZK6K2060256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6faa0eab6b70e1d9a57e7ee3252e7a1414de0f767a7425c762095a1ac58fa3a7. 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/QZK6K2060257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba041fcbc2eed05925dea70cfbb28921f385ca9d632f4db650c251d3a4efc5db. 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/QZHN82029172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa76c00b608964bd1150cbf78fa3a84b798f7b7bbc91d806cc867db4d126baf65. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZK6K2060258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1c230e880e5d9522d18697391498edc32ceba0dd4d4c7a0882d7a1a531ec0a8. 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/QZK6K2060259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e02d84639bf7d7f6cc9ccea1aedd94cbd743f9286e59e34cc710078b1341dfd. 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/QZK6Q2017705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92154aa362484e9c3a5a1fadbbdec94b7fb44f102f50bfe9207b6c2ac3bb0a9. 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/QZK6K2060260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e46eac6f4c2cbdb6457c70acb4c3a40f45a83a2a31eb9619413b9e78b730b67. 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/QZDA42375441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0222b70fba9509b0506b48b6289fd7c320fddb355f2b3a73eeb4a3ac96afd4bb. 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/QZHN72277971.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b78d6e597fe9b1453b186b0ccac60f9258641c8e47dfa8239b53b58d3fe261c. 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/QZMEN2270551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc26a0f6f372dd690a419d2d0f7b2fbe8d93714a0660cdf9e8e5dd96dc8b1648. 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/QZDA42375442.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c3f172a27e12fdac789f509eeb8da620f4d9738506e3e6292020c71f7ff946b. 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/QZDA42375443.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3847e9fb7789584aaf749983f5b6e42a042f669d6f7fc3fa0678b0d3486a6d82. 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/QZDA42375444.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3c0ae5517d38bc1636445f397c44f3763fd7320800c4174fd394a93cb626427. 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/QZTB62294263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c516abe6e503956e400c565d8416ac229f8086a7a3ee02d8b31c039b7d276b6. 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/QZFZ22317605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be11de6b4a2d36ae1f09f86ddf54fb7762504250d73990e3efbbac3662991ae. 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/QZDA42375445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a5c70619e584f60f849cce1ffe54d3b1dda9128f1ed1f5fb38b3331b3b2fcf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/QZFZ22493447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd27c6e0e09c91b46dfcf3ca23a4170101e9e2054940604411e2f87cab5331c0. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZTAT2433186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e394e10c227c26cc83db27e69cf83ee20473f92e84e116bdc09cadd6eba691b. 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/USLZJ2169088.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c5524ece8adc2a77c5a302b50690acefe39b82bb2ce20d94ca9a4ca55caf37. 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/CA5KR2270998.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd2a1e891952cd96360c8428bfc91a832505cbed7d7fb1c09e8d2478de52328. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZHZD1916357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dbb6b2a49ebdf02c17c5e2b3b3424effdb4c934516f1d9b8db57e94cbecf5b0. Chain 2 (Bitcoin): anchored in block 960187 (2026-07-30T01:34:28Z), 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/QZ93L2044190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed43866ea2bdaee118671c0dcb30378cc2a5dd34fbd765c0c460d88322fa7d5e. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZ93L2107293.