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 0x493532d5139820135971fa8e806280bb49a4116fb6dbebed78e1202f31490591. 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/e77bb825-06c3-42bd-9921-c6204c5fabb3.json and https://artists.proofprofile.net/proofs/artist/e77bb825-06c3-42bd-9921-c6204c5fabb3.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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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 0x1e09afb583a69c6034b5a30896c7d7607804c15dfa49b26b4972c704376ffa14. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/QZTAZ2333996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x823f83a80c911a9c4869117dc6a2a8b8e737cb100b9cf011fe0565797e43b19c. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZTAZ2333998.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x049ca68a9798a7bddbb5d51ceb6947202a1beb97832f8324e42c78d34e184fdb. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZHNB2468162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a39e12b82cfc42cb633e59292612e0ad8f2161fbc1ff330605e386185340e58. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZNWV2375063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fc24461d1caa557a93f10ffea09a174ae1a77170c6fb2811f358e557a4b410c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWV2375071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda5917b191022f7dfa8b7c63753f00ee93913bd35bca6462f082fca1e186bc98. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZNJW2454426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1d2b67467046d63886013fd6be629baaf023db2fbce0aa0f74bde5837298116. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNJW2454428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaca2314774c460dba22369fb5e5ef64587ab8d256e34505a8453fc2ee2d06aff. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZNJW2454430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e7ce4bb6f223eae60f150f384ed5e6dcd250718c1eba5c39bf0ce8805a293d3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZNJY2457660.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22ca334ce201ede7f545d6da176921ceb22b079d09529ecb3807ef52adb9860d. Chain 2 (Bitcoin): anchored in block 958397 (2026-07-17T10:29:45Z), 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/QZNJY2457661.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0c2084b0a26a8342d8a411a522a573ec3bef1ee4c33ce646ceef7d4a4018dc. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZNJY2457662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb615f5590f01806ad2c0fe356720052765cfb80a809a084576f535d413c4b3b. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZNJY2457663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1470146ec503c4b3d3e5c0e9e1238938ed9283e84f8e6ae739f369973955354e. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZNJY2457664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9016add23d00f86bc54b95592c020943f8523de458a78390a60440601d4e6fc9. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/QZTPX2407693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2add143ea74aaca577f5b3f96670b7870e6a6d4353910ac30121d5d097f1bc0. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZTPX2407694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc02e49cc679cf4ea5dda9ff9afc1b2db225eb78e1e7056f89b4576dc341bcd8a. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZTPX2407695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe044ec2dbfd7686478b8dc89a60c4187e83750cc8eda5beb2a69a5d3aa7c4600. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZTPX2407696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe00c06d8141c09506c1c74437d4fe899cb445ee12a50ae88d13c73db7bec4d8c. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZTPX2407697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afd397f177f237ceb09ffb2f7ce68a5fb47f4555d507bbb42e3d27acb3a9d7c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZTPX2407698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x170ab61059f01f3c6287b6c49df57c4be7f33d2c93a4dac85487c6ba551039d7. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/QZGLS2513155.