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 0x3d211de03186e2509b2857cf4f28bcbca46ccf1a2794d0fd6ee4482e9556b8b6. 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/ed0c71a1-953c-46ac-83e7-d719e03f2006.json and https://artists.proofprofile.net/proofs/artist/ed0c71a1-953c-46ac-83e7-d719e03f2006.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 0x81ee45479fc537fac4c46ac88b0eda0090bab2313d3a45c76cca4c11afb1c189. 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/QZHZ41944877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f38cc2738bae6bd484e0f0dc04b6b6e72465060d4f145291a5fda3f731b49c8. Chain 2 (Bitcoin): anchored in block 958582 (2026-07-18T16:47:25Z), 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/QZHZ41944878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d8cc8078c4f4923809341b304c68777a727ab46eccb9d4df02d25afc6fc1fbd. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZHZ41944881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9645f3b6599aee13c2d75d8f077d2d5094c41374522dfa96cccd328df9e0919. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZHZ32120959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bc211c6ccb65eccc2f39e965f416a5bf68f472bfff127d2a586c236e5ec7d21. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/QZHZ32120958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73e0132746799e8b8908eed2620e353a2af2c2bcc0d786e981b95d633062b668. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/QZHZ32120964.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112b52b9d5197256882d149fb7db5f3998fb02fe49cba98103eb4512824728d2. Chain 2 (Bitcoin): anchored in block 957796 (2026-07-13T03:24:42Z), 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/QZHZ62023479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5301ef298cab203ad462efbd2fc147f5badbef2ef38368ae533eccc6219a27f1. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHZ62023484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ee187b34398b2ae09653e1cfbd6b540875754f3945af5407d674a8f666c41b7. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/QZHZ62023487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa712bfcdc1c75b6057088e2d8f86e7b5cdb1f4f788b9ad1a22d9cd787ca8a859. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/RUAGT2204806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d1f9997894d6a9e4fad4b1fcf518fd6224daeee2cc90ba76a07fc9e158b7096. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/RUAGT2366433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3984085d2c20fec876341b7a4c922715d3cee78189d04fa6686af672546f189e. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/RUAGT2366435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90302cf1bfb39bfe04e7f471e2a49149b08e1cf9ac07bafdac7b02f3c8516b16. 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/RUAGT2451731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63577762b52a9f1e32d62a8633f56febbb599684566c4682ef7b4f846e24c61. Chain 2 (Bitcoin): anchored in block 958676 (2026-07-19T05:43:13Z), 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/RUAH62423753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc8328969fd4b7d4047226de56aeddd50d0cab72fd9ff20ac624cad78f4285fa. 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/RUA1D2586075.