Tuna Académica da Faculdade de Direito da Universidade do Porto
{"copyright_id":"0xc5f3823b0eaed233413158cc9185e1baac68e96458907d23e721896de78e51b8","name":"Tuna Académica da Faculdade de Direito da Universidade do Porto","registered_at":"2026-06-14T20:43:52Z","symbol":"NIM0571173","token_address":"0xfe95928ec156c3e449bc3a4eb76d5d8e7b12abf4","type":"artist","uuid":"9a1c4e6e-00b9-431f-8b3c-9e3bbcb2ee5c"}
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 0xc5f3823b0eaed233413158cc9185e1baac68e96458907d23e721896de78e51b8. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9a1c4e6e-00b9-431f-8b3c-9e3bbcb2ee5c.json and https://artists.proofprofile.net/proofs/artist/9a1c4e6e-00b9-431f-8b3c-9e3bbcb2ee5c.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 0x7e44f5e3239a06ce1334fa39eee4ae6669ff350892704af395ec2964b17d4b5c. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/PT7FG1600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44ef96c7ba4ee05c888e4d433110ab7fbdfd5f5055c4a777fa6fb60ba10b0bc. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PT7FG1600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db78dbf75a776f1b4e872d8ce363f8c64f31faea4532f3f90546a34f385371f. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-20T00:16:02Z), 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/PT7FG1600005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5430f0c99ec3980f25dbe05924d7dbf88439562dac9e269f018bf4e2390a488. 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/PT7FG1600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf2396ae7ae3ac498a64c53178d2e1e289034ba05977b44e22dadee021e10cf6. Chain 2 (Bitcoin): anchored in block 958576 (2026-07-18T16:22:28Z), 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/GBMJG2304081.