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 0x0e4fd3131c6c324d7c3f746b4ac355fe8656adfb067a26ec1eba781505d87fa6. 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/a1b48e72-4a52-4638-b7a2-c8f243ba5803.json and https://artists.proofprofile.net/proofs/artist/a1b48e72-4a52-4638-b7a2-c8f243ba5803.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 0x3c17966752e22d4f3ca5ea857167da00f0725d685e680f07279107bb732e6edc. 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/GBKQU1578289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59f1425b10de7cdd74bb03216218e3f934ded7e4f2d6bdadc320176774ab62f1. 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/GBKQU1578290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9be712a581134cd7d967299818a2c7509de0c83b9e0a1f27848fb0a462b6ed0. 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/GBKQU1578291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cda7feae8a6bba1efa7ab052850d93509f9fdf653c766fd3f471c9075a2135b. 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/GBKQU1578292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54c827f5a86dda9dffce6523a84b2cc84fcf6eecb0af7c781540e17769d0a2fe. 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/GBKQU1578293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f65293e0d2adbb10e45b132d77b1f3193330f470158f9bfaea553e5bb3eac20. 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/GBKQU1578294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3251133e6f87e5af5ed599a1ef3d370e43c2d16e751a2a698ef5f4f051d66cd. 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/FRPGB1730600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcac3559b92bb729841005447c2fe6c2ff5ec3772df74751301816eec2507461. 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/FRPHC1500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9012ce8ce02251e65cdd0291dfcca825b6ad29310aecf520ecbd62c9772eb3bb. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/FR10S1496470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1707ad045b4a6798e9f4f9bc2670e9b219d069a33b081e7b7ce86ce2fab893. 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/UK8Q61500107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9be712a581134cd7d967299818a2c7509de0c83b9e0a1f27848fb0a462b6ed0. 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/GBKQU1578291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2b0b3b1326cbb1829a870cc417b32039392394e6734f37fd59ae30e80e3fc72. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR2R01600100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcac3559b92bb729841005447c2fe6c2ff5ec3772df74751301816eec2507461. 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/FRPHC1500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ef5f3c23b85aced9b750ce747f78de7631682ca2921789d7d5df49d9d4ccfa. 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/USQY50976208.