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 0xa1af18b2e9c76e5f2ad57e4dca43a9b689acb68a1b65ffa916fd8c994639457e. 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/4b6dc365-892a-42aa-aada-b60f94bbd76d.json and https://artists.proofprofile.net/proofs/artist/4b6dc365-892a-42aa-aada-b60f94bbd76d.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 0x24a5fa0588507a2e033f6651cd7a26ae583a46f8dfd9a09e24d074287103c027. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBLV62216260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9cf9f33281927035587e36c296bb8b646dd1e3e55df89c7fd252d9a6477c63c3. 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/NLE802400042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7121966f9a15b9b4e45cf420d0b50de7526edaa0ef926b5b845a135b796f7912. 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/GBLV62306917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7121966f9a15b9b4e45cf420d0b50de7526edaa0ef926b5b845a135b796f7912. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBLV62306917.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439d41b8a9d6d96459b6a60bf0c8b118b2ba0752c1e25bb7e6151b807a2b6065. 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/GBKQU2181032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50de793e0e0c76d5d0c27685440fb7c024cc125e6666b2f55323088e48888e8a. 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/NLH2L2400201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe217ad085d661495e3cf2b20aaa0b1615eaddbbc3191de08a883d6d298aa7c84. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/GBKQU2453570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a3af967f1207a0db2b67a26cd6f372ba7df37fc503258f500d54b3c661c8b0. 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/BEB682300204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2757739b4fe8decc96c12b95ada4a6a6a1a79bf07c103d792e620bcfbea65b6. 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/GBKQU2345743.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44c908da345b78ad9aa565f858cb0d24dc9966942da9e35e827e89a94898bd9. 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/GBKQU2027364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x439d41b8a9d6d96459b6a60bf0c8b118b2ba0752c1e25bb7e6151b807a2b6065. Chain 2 (Bitcoin): anchored in block 957034 (2026-07-07T11:52:37Z), 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/GBKQU2181032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e0db9ef6a5426bead0dd105565cd370bffb2bef2c1f0df5a01340c0bdd06d0. 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/GBKQU2430931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc965c85a77891c0fbba7288d277b44c22ade9b1915a1c72f62bfbe9fc06fa40. 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/GBKQU2430932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb84cd5ce5c7fb7efaf60c8873151934a16c85b5c280d65e075eb8475052894e8. 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/GBKQU2430933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9c651ce230eb52275dee266d5a99537ef29514884854db0f3c1464d9cdc15ab. 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/GBKQU2430934.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8618f318f39ac0f3efb0951d7b8f2b833c33f473f27c4cbddf5a4c50a7b4c97. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GBKQU2430935.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc965c85a77891c0fbba7288d277b44c22ade9b1915a1c72f62bfbe9fc06fa40. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2430932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8e0db9ef6a5426bead0dd105565cd370bffb2bef2c1f0df5a01340c0bdd06d0. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/GBKQU2430931.