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 0x590c75225a9ce5685857725315642fcbce06cc1bd127cc6b56fa0067b61bf7a2. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4a9d5477-e082-4508-b486-45abfd1db8cb.json and https://artists.proofprofile.net/proofs/artist/4a9d5477-e082-4508-b486-45abfd1db8cb.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 0x8b0ead51a7e9d750c742d6a2397bc61b9eb0499d637ef4e23d02e822d979ee36. 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/QZPJ32153931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28340d42e1fcc45ae5ce522f756126446cf91c2c155a290e485930407df8a5ba. 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/BXAT62400173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce0aabcda745a6dde1eaa34f895655e2089357632afc783df6b23887273efc09. 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/BXAT62400023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b5d04887572f83d18a0ec904e930a1e1435df1cbc67d5e0bfa55d7f8448d8d8. 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/BXU0A2300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd66569a4b3322446b57b68dba09e9ec738cd88ddcd572a6a8c9d44537a506d65. 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/BXU0A2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1415b14d26d1ffd1aa2631dff914d39d8d08fd6679e7fea3f1adcced79952cca. 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/BXU0A2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc6107686235d7aaf370e0b3d67aa4c34ac2fb5e9e6057fbe53b34713333009. 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/BCIBM2300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9370baa224c1417e491c9882520b71ba82f1952c3aac7c0e778d5d2753f3b77f. 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/BXU0A2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c7f8d4bf567a2ced66f656078b599c3dc19b0ba6d825059f5c8e294bb61f4b. 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/BCIBM2300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70fe2865c81672ac1b7cfde6857f4850db8d5c99a097a7a292b2129119d5af11. 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/BCIBM2300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9370baa224c1417e491c9882520b71ba82f1952c3aac7c0e778d5d2753f3b77f. 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/BXU0A2200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2ffe1d85f514a8ea82539c220ceeffdef71ae967da3d2d89133715b5350dc74. 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/SGB502237653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9cc62128b43744e28ed6c0bbfc4549c57ac136eb985346e6264031b6fdb6f0f. 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/SGB502237654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27736b18b6690816e6b1b5cac6fa3bfab1ca359d3de43007dd31b49fd635e8d1. 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/BXU0A2200005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48139b3bd8736a4f634d53000e5bb3e87c65965e17d10d4af7dfe7d0ed3a4566. 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/BXU0A2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ffe98be3eb88a6a760923f361afd8153ef2931648d93a995557617298c98b85. 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/BXU0A2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1254bbd11246447c8d54432a5102278e815aadf692b0fa5def5026232520f217. 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/BXU0A2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20faf5ac6fe39be0297ed6ac86d816c3178262979ac7d4699193452b8b154220. 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/BXU0A2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0b9083ac617930eb156798bed900ea060b69934b7766bb57963adb75d3b62d8. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USHR12346110.