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 0x5b4c02900eaf785c191792a70d71e704117cfbff27d4abc479684ed30e6c40a3. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e122f83-9859-43da-bda0-c4a6bde6b6dc.json and https://artists.proofprofile.net/proofs/artist/2e122f83-9859-43da-bda0-c4a6bde6b6dc.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 0xc7cbc7b01d867f7169dacd2b0bc1ed0f8d8ef7f823372304c483de94b31c50c0. 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/GBKQU2287155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aeadd678928409cc9770d255664d0d5eecc7e360616227132421a65fb4ff100. 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/GBKQU2287166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x151173c45c919c2682279e143f323d278bc4dd8b5278befc0ad1f149d445323d. 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/GBKQU2287169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x614e3ce56ec590ca724956c3568b827f733df1b9acd2db4715c1aba84ccb045f. 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/GBKQU2287201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47c4e58693c60556221a204f210d23e42a400a9768556f8018c6649797eae7d9. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/DEK601909048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3552406b50e6c52ff277a61603a54f32e4d6d9cf0d33c17be243a5fc16d857b8. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/GBKQU2456469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabc6bb1101b4a3cd957eb6d743a7c9bf9a5aee808b551a8b1785e4cb76b9215. 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/GBKQU2456470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd94e3933c21c83df3b5341c04728baf2ff3844f8cea96def9c448fc786561e52. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/GBLV62009601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe482655279e7f1914dcf22883503e41c7c0ba5f8fbdbfb616cbcaa2fc74b7f3a. 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/DEW871804292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ce996c8b23c584b578eba2d649cbb0016c831bf82b6808d29a93eb1c9a8a95. 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/DEW871713369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8e932502e0de04f82a0297265e90fcd95f42c0bc95a06db9194dd846cc6ba06. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/DEW871808799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33faf7da15cc94c103b3380f888eea097bedef57e015a85fa4cbb48927c0dda8. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CA5KR2082153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d6c47b62eb3a383e479d68d65f420ea91f7d4c881523ba3380cf37a6e8809bf. 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/GBLV62012799.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd340271ee41b01b1df4820215fec49cbf8d99d01d2f3e67c25b60b00dba167ee. 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/USLZJ2220391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e90cca2f4d6279237672552ab960440690c411dc9ace221dec8bc3259105648. 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/QZ5FN2469198.