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 0x5af9fa79a57acbf528db3dc21491276996a1c62820dfc14c7dafeff12a052082. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5c920aad-9db2-4839-b148-0b8937c6b287.json and https://artists.proofprofile.net/proofs/artist/5c920aad-9db2-4839-b148-0b8937c6b287.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 0x3d5c173f3773479a7d9b8247b1147f2565a703e12f7938c928e3430eda06837f. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/SE6I32310887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c8e1a4b108017d24e7dda6f347615e471156ab55ca7c0fa3fa7118914d4bab8. 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/SE6I32310888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15c651328e4cfaf1903483d13c98592e298e811905a6080fe7ccb50250fbfce9. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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/SE6I32310889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fdbba580b64b3e616fb70d72557815f0ea93303aff2e93b5cb096058e3b4b37. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/SE6I32310890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ef6cab98ceb0d8cd6413344d15e22aa57d6c5cd63e16a8b00e0353f3dd51c5. 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/SE6SA2461597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0552c41ea4de0234d3f45c6b91ac454f94e80450477b6b21e0977e5e17d5e7. 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/SE5BU2514938.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x147fe040330d13c49140c8875fc174ce5d8812f275747b1a9c0de9a5e2252523. 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/SE5BU2514939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5698681ac559d6e504d659e338a45f4889385f3501fdfa0510b07a7171f0b1ef. 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/SE6SA2402834.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x116555030610bac37729956be87fb67ffa2a50cadc3f4e93abacafbf3ee4920d. 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/SE5BU2514940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a1985cc02ee0571071ba027230117f3818ca870306046f0a40745a64266263. 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/SE5BU2514941.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0259b070619b539fd5ce70cbdab44b1fc93a4b1fd19fecb5170d7cb2e51fb5b. 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/SE5BU2514942.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff79865bec3fc57585d22dda22d414da238083c70dabedee2850c497e04dcaa8. 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/SE5BU2514943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ef6cab98ceb0d8cd6413344d15e22aa57d6c5cd63e16a8b00e0353f3dd51c5. 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/SE6SA2461597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86747154ce86f5c3939dc551c607f3b44c6fb93c357758ca8a6fa9226c4e9146. 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/SE5BU2514944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d244ddf3fca6588540a6a35716edb6b3d1a6d22e3a3d858b9a6381d35a56027. 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/SE5BU2514945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc5c306f721fe510a7fe7595757996d0bdf0bcdb2909ae8cce90b70229a9344f. 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/SE5BU2514946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6a440c21707a58b47bcca3272a697fb924f014f184ba22a54fcafababfb8c9. 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/SE5BU2514947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41fb6238e3f4ac5623bec69c3cc4e75f6f995467d9e7e77eb93c630325e2a274. 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/QZK6N2476690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05b6123a0b4df9fd68ca73a840c079d8e5b6e1872d72f1012658bbe1019e0084. 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/ESA011549571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe47f44fbb74c665b106272a1f8533ecc039594c80deab316ba33784653ee60e8. 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/SE62M2316028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdf9e9f49934e339595f4b86ff78942011c448520a121049ca486a62ef38127. 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/SE6A92385166.