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 0x8e6854558556827b3a9cbff3a795a3e37a97e305419aa64887ec71796494348c. 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/3d241917-1acd-4444-8e2f-fbc829ba0b5c.json and https://artists.proofprofile.net/proofs/artist/3d241917-1acd-4444-8e2f-fbc829ba0b5c.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 0x719bdbe72270039c1b6f312e7eb6a72388a3f89a87dcb65f45fd870cc2f2d2a4. 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/QM6P42021375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ba1940d73184de236004b5887ba8112e71e62b03555c0e510f99fa66c45210c. 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/QZPLR2247477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d2b501a2d8ead354a27fa1f0450c4384302fa21eeb81d8330ccadd89d486f32. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/QZHNC2162885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32bbe643d2756105393dfcb1e13a50e91c606ebddeef307d95639e747240c750. 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/QZPLR2247478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9b8a15c54e4e5eef9ba8b2517a379771f36bcd2e344056eff714ade484c79f3. 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/QZMEM2146033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa323c1131cde05a2d4d2ae7210a70d8de60dcf5ccdbaa36d2ead4b740ab2e064. 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/QZPLR2247479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a04134526f401bc75dfe220254dad32a61c46d78b6eb1ac445df3e4c5b58546. 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/QZES92262249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58c414dabde82cf9ab08b5d2d710d04e891383d417ea40a4a9e4f43827aa338f. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZPLR2247480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd156237288e1f092909edb72acd85db26a3e733ec48aa5dd1d8ac3998f3c989c. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USUYG1380586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc237a95649468225388553ff3036e6501e3c991d3f315fcc5db1d797c5b79dff. 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/QZNWX2133107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c6ce63b6c06e09367216743d3a6bf2e58dc2a09723acde11f6dc171ec62e13. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZK6H2221212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82133a1b4fcccc85d4388907b144540335a4778a6cc69c742d996d219608ffe9. 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/QMGD71500104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7354e31f8e30407c5639d47f1fa002826443c9240a137fbdaedde8230ae3991e. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZ5U81700038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52c6ce63b6c06e09367216743d3a6bf2e58dc2a09723acde11f6dc171ec62e13. 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/QZK6H2221212.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8082ca8b90c9e2adf1cfadaca5d84d902b84b2877d2df132708d1d49ea479858. 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/GBWUL2339302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8082ca8b90c9e2adf1cfadaca5d84d902b84b2877d2df132708d1d49ea479858. 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/GBWUL2339302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dc31792e2754dbe380f915501ef66fd142e2ce5d7ab0b9df5bf0bca5e9e7a03. 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/QM4TW2092478.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc489f36f75a97f4615c5d368e2c798d7e0e085207575da3df9804e4067ae744. 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/QZ5U81900269.