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 0x1dc357c805c31e41c98a3cc5550346587d9b0bd28edc62414dab2417d4ffbbfe. 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/528d2c50-cfcb-472d-a42a-8266a118d5ec.json and https://artists.proofprofile.net/proofs/artist/528d2c50-cfcb-472d-a42a-8266a118d5ec.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 0x0924610f448843e238976db3f7f6a96fc781561eb105dc18d38e2ad0319301a2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/GBDCR2101106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf0930c13498b70252648f446a91ceacd3db394f428b70d8ab0bfdf2735acacc. 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/ARZ021400258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x796fb15df74eb58b814e6a4f2cece9c5a122203fb760127f497e408cb0b542d1. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/ARZ021400259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x457aa29a5dff0eb05cb5e14dd429da43a1c73d5cf57b6612e94c18cc58c06f94. Chain 2 (Bitcoin): anchored in block 959024 (2026-07-21T15:31:18Z), 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/ARZ021400267.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec275ce5331054e49ee343efb929846df0fa155030b7c915fe3763d63552f3d4. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/DEXX21900065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb805349c267cf6d8f88ef3586e7cea62a6bad4101608ff42980643df53b27d4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DEXX21900068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ed7abe2fd310a53046a348569f045508e63dd3db003ecf83f6779cdf4e8f15f. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/GBDCR2300047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241e0626557e40c94ffc0a485a65adca883dd44590afd8f33738f41383c79cd3. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/GBDCR2300049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f491b15ae585f4c16655e23d5dcbf03e15a892c4e3dedb833a09b68edf7d486. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/GBDCR2300051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f2f16c15c5d1fd1967a2a984ceab14616c532d45fba944c3bc725c0c7c64ab8. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/GBDCR2300052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5726d4a84456f75d5fce0c0aa8ec5c00082d981fefd8fca472be69c66cbcaa6a. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/GBDCR2300053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x297cc69ffaa0128a91c94d0ef229c0d55595fc62e3dedffe21e9a78db33f6648. 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/GBDCR2300055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30325a8e29587d1effa278b90b9732c984a50b27661bff1b154a75fb5c13fe4b. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEXX21900082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7503168c48dbd084fb20fb25f6ff1f794761b9441db864b962a107ab24e7e029. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/DEXX21900083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfdc6080daac040b6753019a430bc6390071c6c8524d5d43862627e3680260dc. 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/DEXX21900084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55435c7d483b08c060b146827412d25f7cfc92b20e7e9cc9e2f3cc60b2d5bd17. 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/DEXX21900085.