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 0x8075ce5137c3f35724d735de94c79f0b1a7349c3a86a772a51f689e406eb0dc9. 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/f73177d1-9331-4e98-9aaa-f6de124e7766.json and https://artists.proofprofile.net/proofs/artist/f73177d1-9331-4e98-9aaa-f6de124e7766.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 0x09f13dddc1ff97d41b22a4f8db13b2c45011963ad4b82772f82622312b4230c7. 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/DEZC62434602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00b8ec1e140c8adcdcbe654eaf50816ba77d2721b6448b04e8bfec78865f6014. 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/DEQZ32000650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f35013b0c5abe38d621ea9ea3751170e6b2b00cc89a6547a656e5350c7d35db. 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/FR26V2071893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11e8fef41686251ee1acd9546066bf3650a8b9876fe378bdaf0a6ac5c186b588. 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/FR26V2071894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa681062c30f692f5499964fb91a53ad05c8de094cd23f1c01ac5baa79c22b88b. Chain 2 (Bitcoin): anchored in block 960125 (2026-07-29T15:38:18Z), 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/DELJ81814802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01d1551bd1aa49b27486fee6b5e851436647f703391c2fb5564787dd0febb4f. 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/CH7811707843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x563eeb629e9aa93ad08f0856d4b672cce5f33fe655c008bdcd410a827d103de0. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/DEQ022119066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb584dbd4d9de2a469b13a627f1434ce4d65162c7e92e1583521886c7e5a18449. 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/DEQZ31900606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e7f1dc83734d22ec679e7f583dbbba82d36be7f4035fb97c92a84a9eade5dd. 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/DE1CZ2300113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43e7f1dc83734d22ec679e7f583dbbba82d36be7f4035fb97c92a84a9eade5dd. 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/DE1CZ2300113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x196bf4acaf80323722021cf68ce4ea271054c95808b83604eafdfaef7afcbc36. 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/CH7812215573.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47f714c7c787aa674bc41880ab9153289d9e9db550e4d2399194c338bbcf0aa4. 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/CH7812218560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f25ee050fb2381a3768bab96a0efc156b5b995ea1f39ad0a70ee6ffc40acfe9. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CH7812221871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2421af5b173aa3dabb362e2677c1f05f5570e8d48b403a9ee26f88f92f5fb2a9. 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/CH7812221872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5c386fc548eecb4ef95bbd9eeea2c97d2f2832e1d33683e8fde9c27b342ba27. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/CH7812221537.