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 0x8b6ef17d3cb2c1cf2ee36f0c01561228d63cbc99260f2a271bef144f50dcc89d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/394e3461-3f4e-4c75-a50b-52308e4305aa.json and https://artists.proofprofile.net/proofs/artist/394e3461-3f4e-4c75-a50b-52308e4305aa.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Recercada primera para viola da gamba sola
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 0x27d268d27270a125eb2a9423a77159d2038327fbd4673386625102f65bb5b546. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f8fb759709b6216ea6bad3bea9e25937e2dcafe74fcaf134f1a6e24c8e87d69. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100002 — a six-check JSON result.
Recercada primera sobre "O felici occhi miei" (Montfrin)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65980c2c3275e26b36bf04b67e37a9964ce3aada92cb6fa11572c69c8c391889. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100003 — a six-check JSON result.
Recercada quarta sobre "O felici occhi miei"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71509a16166e16fcb630acf618f02ec46b6adf727714b816a93e8af6f41780ed. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100004 — a six-check JSON result.
Recercada primera sobre el passamezzo antiguo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe348331ae52df72dbffca62baa5c6cdc03f42e5d75add0769149cde9b2ea6271. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100005 — a six-check JSON result.
Recercada segunda sobre el passamezzo moderno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd02820c9745f47c2e212b4fa0fb2cf2fd66dae1d4d1896751554f21fac1444c9. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100006 — a six-check JSON result.
Recercada primera sobre "Doulce memoire"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x164c372c723724b9957e9fd259c524faae7bea8e7124ebddfe24f72d98735fcd. Chain 2 (Bitcoin): anchored in block 960354 (2026-07-31T05:48:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100007 — a six-check JSON result.
Recercada tercera sobre "Doulce memoire"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf6471c936208ff59c461da94fa36223831ec76f26f8ec2e8a47173ab8b43cac. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100008 — a six-check JSON result.
Recercada segunda para viola da gamba sola
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x942ee8bddc85050d083addb09088201d618e2b210fcc81e44cab8cc5b65e13e0. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100009 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e7fb518e05b70db5f31569f332857ded2590d91d203568b25633712dd08c9ac. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37f584af4730c39f5067e2d5e6f34a225509660f59937d8cde8e3bfe636a03b4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100011 — a six-check JSON result.
Recercada primera sobre "O felici occhi miei"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b25151b2ede3f03c884801ed4161c25a64870f750fe54fe10419e6c5a0ccf2e. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100012 — a six-check JSON result.
Recercada quinta sobre el passamezzo antiguo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc419caa7c749114ad5edb7fdfea44778bc0b0c537d75321a573d2cbf177f2287. Chain 2 (Bitcoin): anchored in block 960435 (2026-07-31T16:33:26Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100013 — a six-check JSON result.
Recercada Tercera sobre el passamezzo moderno
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77b4d8019cabc8dd190ed400c5424158aed22e388b356683cfa92d4c38c93805. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100014 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea512cbdb7c8879c55867b0894438e62c3826d33916a5e3759b741b2ea81716d. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL2100021 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e1e67c63c431149284e1576f60e480ed0106194f96be46031e14dc7b4190f1e. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL1900001 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1629b2be077ed0e3f2184bba75f5f9a5c3c43e8165fdc88f2c543804b1126f2. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL1900004 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cad1f8df0563f218ced2fa0d9f08edf0dae83e2ac670c0b2ae02f60258296f7. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITYVL1900006 — a six-check JSON result.