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 0x8780437124a88ebe40a2ad7e21b8c0f5bc70cfa24d7f60d31610168967fd9b60. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/54ffec49-e36c-4330-ae26-1b0a821961cc.json and https://artists.proofprofile.net/proofs/artist/54ffec49-e36c-4330-ae26-1b0a821961cc.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
The Girl From Ipanema (Arr. for Guitar by Sérgio Assad)
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 0x6caf7565a259626ee8ed43e31381b207325eed7075fc25deb7b9ebaa317f8359. 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/USUM72206060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x060c80ea58cbfc823c920d6bed71d4dd882aa0140c6329915a0c3bb2d90b1f9a. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/USUM72206062.
Gracias a la vida (Arr. for Guitar by Emmanuel Sowicz)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5d64d04f1f83b45223ded6862d993c7c478c7da590af1a254545d495241aa65. Chain 2 (Bitcoin): anchored in block 958716 (2026-07-19T10:15:55Z), 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/USUM72206074.
O Mundo É Um Moinho (Arr. for Guitar by João Luiz)
Prelude, Fugue and Allegro in E-Flat Major, BWV 998: I. Prelude
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07954af2f41d0a80141ff0017b5646ad911dafac5091cf2069523053e60f2544. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USUM72309383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467ab35c9f9beb98275a6eb6233036f1e447a3baf5ac3ea68b9378edefcf93ca. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/USUM72309386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26b74958c4969313d8369942e1d0c801751c5cdd48b5bbc1fc23d458e6d4d558. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USUM72309388.
Comptine d'un autre été : L'Après-midi (Arr. for Guitar by Sérgio Assad) [From "Amelie"]
Merry-Go-Round of Life (Arr. for Guitar by Sérgio Assad) - From "Howl's Moving Castle"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c6231516c425593b4deedf055568931f0a4c9f1346e554dcd6944535ca3f7aa. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USUM72404493.
Cavatina (Arr. for Guitar by Sérgio Assad) - From "The Deer Hunter"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2a162e0f222bdc281c0eb79342321280e095c0bf1058baa8c4f93f1aba2a5bb. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/USUM72404494.
Viajera del río (Arr. Assad for Voice and Guitar)
Yánez: Viajera del río (Arr. Assad for Voice and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3be950f5f48b6c2b3eb7a1ba4eef31a6000f33da5a94772fa1800244c561acc. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/GBBBC2301514.
Scarborough Fair (Arr. Parkin for Cello and Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe369405c5db8fc051fa4a4bfd31c44b85a9d799f1ea9d453817c4fee5694472d. 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/GBF071900750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe369405c5db8fc051fa4a4bfd31c44b85a9d799f1ea9d453817c4fee5694472d. 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/GBF071900750.
Grieg: Lyric Pieces, Book 1, Op. 12: No. 1, Arietta (Arr. Lewin for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2a9c1f63ab153de3b050e1f625fefb666d2abf00200770309d175a280a9ea0. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/GBBBC2400404.
Belli: Prélude (Arr. Lewin for 2 Guitars)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd2a9c1f63ab153de3b050e1f625fefb666d2abf00200770309d175a280a9ea0. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBBBC2400404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe369405c5db8fc051fa4a4bfd31c44b85a9d799f1ea9d453817c4fee5694472d. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GBF071900750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe369405c5db8fc051fa4a4bfd31c44b85a9d799f1ea9d453817c4fee5694472d. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/GBF071900750.
Once Upon a Dream (From "Sleeping Beauty")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcafcd141b35e14c623d24a6f4bbe185adc4cdf9a9fe071500be4547e18ca3979. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/GBAYC2202474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07954af2f41d0a80141ff0017b5646ad911dafac5091cf2069523053e60f2544. Chain 2 (Bitcoin): anchored in block 957084 (2026-07-07T20:41:57Z), 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/USUM72309383.
Prelude, Fugue and Allegro in E-Flat Major, BWV 998: II. Fugue
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c5c3915ff6503c014687f8e6e3a6aabb0994ea37498b40ba8932354163a39a. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/USUM72309384.
Prelude, Fugue and Allegro in E-Flat Major, BWV 998: III. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b794047d20b00c9bdcabfcdb86dd7118758027de374408bc26fe4ee7760fef9. 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/USUM72309385.
Le Beau: Cello Sonata in D Major, Op. 17: II. Andante Tranquillo (Arr. Assad for Guitar)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ff322dc692a549f0b830c9cdee4e8bc2503da71312a8691fdd252060ebd57d. 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/USUM72501238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd69643a752732594b4a3f6bb9f441b884abe121287374308a8bdeb34b8d0c0ed. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/USUM72217883.
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