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 0x72714c2279623f64790dab2c03779dc57731e37b45fb7402b1b68d8e206ba982. Chain 2 (Bitcoin): anchored in block 953984 (2026-06-16T18:08:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2e269048-c7bc-4ed4-bad2-4d6b8ea7d82a.json and https://artists.proofprofile.net/proofs/artist/2e269048-c7bc-4ed4-bad2-4d6b8ea7d82a.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Tarrega, Regondi, Giuliani, Castelnuovo-Tedesco, D'Angelo: Rêverie Italien (Guitar Music)
Francisco Tárrega: Complete Guitar Works I (Original Compositions)
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 0x703fbc07852f5c40770ec42e0ad14ac21788e5a6cdcb1376cb67b42053e73ddd. 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/ITLF52311619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0326370431b32bd117cfcf4c5e97ed75a964f34e2a963d801201e98cbf0b13d0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITLF52311620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62496c600a2a9385a6da308a1e84d3324cdf055de4e48e46f0f38003d19dc6b. 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/ITLF52311626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc499c654d935dcbc8eae49495cd56028f8e85223fcf1a781a59da8cca22870. 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/ITLF52311630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1db500613ed13d130fe170d7226192265c72ae1589da8fe3b93e76f43b9437. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/ITLF52311631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0797e2abbf41eddd7f10405b9ff49581f6724d395b2d051f478755ba6ef51f2. 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/ITLF52311633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x792793837b831aa307ed3ca14770836218b93bd9881c89fdef1988f28b794e25. 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/ITLF52311634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04ce6209b6c6dc0f9fd470c0ae006f953cc850cff8e2a5af4b8e24ca5fb0f754. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITLF52311636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3da64cafbbb4df1897d45ffd4f944c97a978cdee0d88ca0ea25b527ffa4156af. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITLF52311618.
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 0x33428097b03eaa0f9ea625070c65e51758c5ce8cf9619bb7c1135ac04e6adb9b. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITLF52311621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0467c84634616c622640fe3844df2920b81516dcca32a54e6267c9d94c8d10a. 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/ITLF52311622.
La Cartagenera (sobre motivos populares)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf01d00d92d0ba688752a62863ea24aa1ed79832af4614967f3ff67f922e0598e. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITLF52311623.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x250355e1b9e73125c8e2a69964999702444cab5ef46c71f6dfd0fb49ff5c1b49. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITLF52311624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3b40f8d4f26db5818a0f8023504018cce853a594a99e9c41300e38740b48e0f. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/ITLF52311625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d99fd394f044cc17afe08937c17cc5f392e4bc08b05c947f91f65292ffa6ed3. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/ITLF52311627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa93f5204164fde1585ba19ddebf7338775dc123da0a0af6157a135f2c13bbbed. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/ITLF52311628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38c3d77c77e4ccbbe73e2b99aaa710a987442f812dc23b654d5610d9c06f691. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ITLF52311629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadfbdf91e3e850c00fde767427e7f0d24c35abd13651f107d4ca67e9205545d4. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/ITLF52311632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93aa04b599a9a041b67a6c2cb7e5be75f3e2b698b6a06e339eb89dede83b2214. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/ITLF52311637.