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 0x74cd36ccba039bf44fb67c570468e859c67c6041afb5a9fbe88bc5e0f36ddae2. Chain 2 (Bitcoin): anchored in block 953842 (2026-06-15T22:22:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/f7886cf1-10dc-4c62-81a2-8c4f9a40c6ff.json and https://artists.proofprofile.net/proofs/artist/f7886cf1-10dc-4c62-81a2-8c4f9a40c6ff.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 0xb8ee4d8ad21f02c96d20f38b12a168432a35418f603fbbe65fb14f73c961f695. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ESA011412055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3c2e5d46873c8196877e0b0add1635d5a69db12babf3f9612effa05cbf42d52. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ESA011412071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2cddf965995c41eed2f070a88c99477b634d9893cb3142bb29db95a11806ef0. Chain 2 (Bitcoin): anchored in block 959103 (2026-07-22T05:56:21Z), 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/ESA011412072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec104cba9b4a44d157e05c29e52fc8d1b91e031d9cb3b7791eed645ada4418e6. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/ESA011412073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3513afcfd8b15cfeef377d639890951328f783a3367dc735c596f78d5fdc344. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/ESA011412074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b9e2582ca797e03838e9079862ec3d41fbaa5dd731d34ef9697342451289280. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ES09S1600652.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f2354e358f5766d3037bca5c14c0f5c44e3811e6fa3cf9549078c4cf6b73af6. 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/ES09S1900359.
Garai bereziendako kontzertu berezia - Atabal Biarritz
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b7d0b0f54791efc1001c71f4d74398671126b2b7b94453055389def48e3e483. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/ES09S2200174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf04fae8d93626a4d111cfd297040e6af950d8dfc7cc5fbc1305e8339cfd6f032. 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/ES09S2200175.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8cffa7958a12d920cbc7eb4e900438366a70a656d5f6585d7ccc9a547ecc3f9. Chain 2 (Bitcoin): anchored in block 959080 (2026-07-22T00:07:05Z), 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/ES09S2200176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cdda0e1925131d04d66a387a60b8b35d625353852bfb8f2be1de81859d82f46. 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/ES09S2200181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb8f87ab7e111aecacc6cfeef0be0888c3d3b269c2fab5ac87f6b4c11a466e5d. 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/ES5591500315.
Txinaurriak ( Mikel Laboari Ikasitako Kantuak )
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3851a1832667bcd9a98f76c30e7b42dcb643300d6ce358f747af217cc0bc3236. 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/QM6P41577856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2035b13443ad0f1928ea46549676ac90c6b209af9abe70183004f3f2b2c57789. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QMFMF2313144.