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 0xf70910beb27fa8670c27a76f938156ef15c502bef585b49e9d403f79d1e68d83. Chain 2 (Bitcoin): anchored in block 954013 (2026-06-16T22:27:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/34fb2fb3-0d9d-482a-95ed-909882b11286.json and https://artists.proofprofile.net/proofs/artist/34fb2fb3-0d9d-482a-95ed-909882b11286.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Guitarra Portuguesa por António, Paulo e Ricardo Parreira
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 0x9b9527bb462529222c50ac257ecc21fdabcf6f77939a5c6e78970df61ca3377b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/PT9EH1500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddf26f27b12fffc3cca98ccfc7652501dd24f7e5a33c0933805927501c8a6f13. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/PT9EH1500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35d35873c61255ed131346787cdc3767c359bfba17dab7ad31b7852c2198eb96. 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/PT9EH1500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450185d5b32f968b6b1b1aec047539f662135603018902b81d5d14a0c9b588bb. 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/PT9EH1500006.
Variações em Ré Sobre o Fado Menor e o Fado Corrido
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb24d888fc3161d0b730439fa3851d7c7949803fa1aa533426a13298ee9ee4784. 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/PT9EH1500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe001a25b4c3c5ce5ab5c35360493b32114e462599e3987c117afdd853c9cc18d. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/PT9EH1500009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf6ec48bdc97a099eb2aec53b9bce83759b23223463d410d85b7900855d801b8. 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/PT9EH1500010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec10f24c9dd1b5bd0ba8c83a3c2e4a8e5887694a362027235129a6027b6ecaa3. 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/PT9EH1500012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54ac958acc141c6640c1f900b4cc6ffc71b7b1312c5d855148a69dd7280ce42d. 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/PT9EH1500013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb6d81b6efe7e135c07acedf1b8c4d4fd86814581663da5bcebe4565a3789fe4. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/PT9EH1500014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b8de8f0f37082a3d2b5d351d1537d11609e545610e11c03d96c2efd0cba9ab6. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/PT9EH1500015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94526b22d690225c2fb59dae7980cdd4213408dc471814fe61f03287c9dfa7e6. Chain 2 (Bitcoin): anchored in block 960506 (2026-08-01T03:50:58Z), 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/PT9EH1500016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed82426aeebb45c8f64f7a174b51c54c49f495f499fcef28a87f813cfa1c653e. 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/PTLR14000129.