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 0x895a681bbb31cbdf0a18f0bb3ece739fbedfba66b92d97877d084e0b91728e16. Chain 2 (Bitcoin): anchored in block 954647 (2026-06-21T04:36:58Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/d7c271e4-ff5e-47aa-84be-37ecdf6f136b.json and https://artists.proofprofile.net/proofs/artist/d7c271e4-ff5e-47aa-84be-37ecdf6f136b.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 0x9567a66b9bd2acfa0f747ab153a3dfeac92374b06c023d8019025b01ea1f02c7. Chain 2 (Bitcoin): anchored in block 960339 (2026-07-31T03:13:37Z), 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/BR2AT2300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efbf2c9674cf12fe32132ae2e5512d65662a36b01995004c50350015c3d448a. 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/BXHGR1800023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4c5fee02d8bdaf3a9a0f7867ca78b3a896658f7a874d724a0cf62239caf4c8. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BXMM41600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x265984855f280bc0725064e68f8f050ea923423361e763e5f22779535647fdd6. 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/BXAKD1800001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4fc6ae3808d05dce45307545adf6aff641cffcca2b2d8084adebc7a39e4b661a. 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/BXAKD1800002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bf8b8c448e941a0544443bb1ffc3d8a64e6987ea9fefd69fead6010ac3b58e2. 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/BXAKD1800003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9776c3f9797695f99bce89a7b5b63b2f661fc9ecc00bb198b7f32e7f2380414a. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/BXAKD1800004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c9c3da968cfa571f243296de4dae5eea4c640c058a4a50fbb7cfadfd5c9b12. 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/BXAKD1800005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80fd658ff298d16372561e0874c783f153815cef766224a0307abe1b9372888. 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/BXAKD1800006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c03ff12774ade19bc8094bbc1f5bd8384ffb03805bf6b94dd7d3c9cd16d179e. 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/BXAKS1800007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x356ff8445699cfda8d5f090e8adb7150e101f87c10a05100eaf18e1ecc32301d. 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/BXAKD1800008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f9460566b65879f7cd21ca1694864f8278da95c576b8cb230e2642dd2d1ed42. 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/BXAKD1800009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b3388888b4d3f6ce9c135f6b47cc6ea1ef3e92fb3c52eedcbf43ff1b74d2979. 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/BXAKD1800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5231d4b5590cb0dda96f487c8ac7f480d2cc8d513bbcc99486b6857732b7d099. 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/BXAKD1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ffad1f4c51890b2ce10a7d1dad2135d5a293eda151827d8ce42c8f87cb4d2d4. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/BX8862300014.