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 0x5c75bee0fea3770aabcdc35152daa5dd84668754ad17e38e55e0b79019f2bd2b. 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/f1561394-160e-4c53-b141-041890ee1e68.json and https://artists.proofprofile.net/proofs/artist/f1561394-160e-4c53-b141-041890ee1e68.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 0x203faf18fc4b33b27fc072e6104d0a478e047a5573b50347f3686d6aaecc385a. 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/QZNJX2418582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdda9568595ef67e9a8fbeb3c89950659ec80299aff4616753eba484867ffb47c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZNJX2388868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a424a5b576d2403f3cf2f4da34a0363bbcc01649f559e9a1415fe11c264c235. 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/QZ5AB2448500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03e28dcf31246f6252755ee0a34adc00df3fa702a67314d718f36fba64d9284f. 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/QZNJW2435109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb05b757f9efbf927509df4021d4987b5e2f4e09e4f43e53619497f50e0121415. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZZ8A2367177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b7cd7d0488e42d7c354bcdd6b8922fd84123beb1fbb1d630bd611efc0f11a89. 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/QZNJY2357522.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfab3e3c5faee57b9c3bb5ab071f1a805ed5256e3a7870aad884bd855da516139. 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/BX4IU2332371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x066a0bebcb8287c67989d2e4f510b780a9bc4edeff40dbce1ccc145c07c2dd89. Chain 2 (Bitcoin): anchored in block 960404 (2026-07-31T13:06:57Z), 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/US7VG2412793.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x149ec474e950f268b7b261d29b72dc419c0b1b08a766706840734f419a975ef3. 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/QZPLS2381073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x276db958ffa4f05a7c554d2390e6936c123a18e11bc64156b193b4e33e6a2688. 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/QZNJV2396110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cc1bd5313bf58ab3925b40a45ea1e0048dd82a78800aec820295358663fff2d. 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/QZK6P2375199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb36a9da0bc3e94fa129e59fcfb9d6b016253cc8c5be51f7e60ba6c2987b9792. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZK6P2377189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb5230bad04ee113e01175320698c044ce8e74416edbdfe1d41d8727f5cefceb. 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/QZK6P2378211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c139d9959d92eafea376b26429af432d4e7ac8d54ace9bd10b763b16a277d0. 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/QZ5AB2309404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4edc1bfe55311d6f5df82b1c403792daf30d86a20ee002e56926e2b7c6f7984. 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/ESA112440299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02844a8915df344a2b041510692c899a0157f4c73c7be2f97a8bd040ce3bb900. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZNJX2375782.