Tuna de Engenharia da Universidade do Porto
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6185c93f89d65208f1dd911c5d0e43f62caafbb69ba7eb36c2236b98a36ec96. Chain 2 (Bitcoin): anchored in block 953817 (2026-06-15T18:10:31Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fe17b680-2584-4254-8355-0a1b3d72e99a.json and https://artists.proofprofile.net/proofs/artist/fe17b680-2584-4254-8355-0a1b3d72e99a.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62d82ebbedb60c9a102b41a28c2cd81d408db6d3a0ba199b4ee4f62a0bb20ae. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/USCGH1811292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18a7fe4cf9fa72153b2033e00e3a7b5c25d26bd764c622c40c25a0acf409897. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USCGH1811303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a40418fb2582d1e39a4a630b338fb9f261c43fcf4c388737e6f9651c893ac7. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/USCGH1811304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x230af279983b3f83f906b9a2ff2da7f18399eb1be4159e4eaaf08d0a91681797. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/USCGJ1992106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8852f95fb5969834a21a0e5f28574447eee70e5e889161ad08d28db1f43885cb. Chain 2 (Bitcoin): anchored in block 957745 (2026-07-12T19:20:20Z), 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/USCGJ1992107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cff9cf131777f586f4667da5b0465c1d7f2e44e22a4e0414cd9781aaddd06bf. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/USCGJ1992108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e4e7c45c7f2a1b4728a555149b5c389fe8ef168f54aa01a5392ddf5544e6af. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USCGJ1992109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7b1a8cd3d84bde2ad762e5cf3e562b5bc33649dcc8d67c771e17ba1770cf3a9. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USCGJ1992114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7aee70c8e57722221ee61eb64817a9a39d90262d742a28402304be9a2b27f0. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USCGJ1992116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff020af2e6c70afe9fa0ced94cfeb0309f6647038ae70a56a9ae870d8f49a57. Chain 2 (Bitcoin): anchored in block 958404 (2026-07-17T11:34:58Z), 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/USCGJ1992118.