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 0xa292f959108d87da67b9c8944078bd0b5e40610b7963452a18a0b54ca97c377a. Chain 2 (Bitcoin): anchored in block 953930 (2026-06-16T10:36:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e5e8f5a-d960-42df-9631-4801743aa58f.json and https://artists.proofprofile.net/proofs/artist/1e5e8f5a-d960-42df-9631-4801743aa58f.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Still: La Guiablesse; Quit Dat Fool'nish; Summerland; Danzas De Panama
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 0x82297d2c2d0f8f6bbe79d48056305fa2dd71a3d5129218029fb00bdecd71da06. 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/USKO19300463 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadad9c20f35ac5ad8c541ce5314f4e2960fd23871588b54e19579e192fae5bbb. 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/USKO19300466 — a six-check JSON result.
Léo Delibes: Coppélia Ballet Suite - Johann Strauss II: Ritter Pásmán Ballet Music
Overture in C Major in the Italian Style, Op. 170, D. 591
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e1040b76fa644fa841dbe89d1b6b4c36bbde41b60f9859b8000aad793aeb77. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEDS52136101 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb81913d8571728d3d6e17787301a19962473caef2e6eb9654436edd1d2f51f12. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761216201 — a six-check JSON result.
Comfort Ye My People… Every Valley (from Messiah)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb02b7f0d29af2a666b4859aa00de688a649a5036f2a803f1d818460e9221b2ba. 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/USX761216202 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d0b7bd7da7f5e84ee6b10d5fb327e91ab714a756530c65997c7e8dc604b6821. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/USX761216205 — a six-check JSON result.
Dies Bildnis ist bezaubernd schön (from Die Zauberflöte)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x671f5601387c7688b0b3228506f1be2968c65a95298eb6afe853cfd2895b3cd8. 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/USX761216206 — a six-check JSON result.
Konstanze…O wie ängstlich (from Die Entführung aus dem Serail)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8776a3dbb65d0a4d60c5af6af8624b2123337fc60d7b999696ff799f04a0e455. 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/USX761216207 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3b2cb3522b6a7c7bfba79b04cbfccdd5498015663f4a0ad4fcc13617043fa34. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761216208 — a six-check JSON result.
Mit gewitter und sturm (from Der Fliegende Holländer)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa90d96ef78a92be8a15b9350594bbc3b27ef319387c0db1b294d6542299eebc. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761216209 — a six-check JSON result.
Ach, wie so herrlich zu schau'n (from Ein Nacht in Venedig)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda2d45104e9bcf9ee191a34a06d80d0e1ee7c80926a4584251fae3b7cd17875. 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/USX761216210 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95b9c8042fe81d71b12187b22310a3b92d613f532bb86adf64bb78a614bdb8df. 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/USX761216211 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c36d56f0b33c4f7fe036bc1bd0beddbb432604ead784d31619c6d08ecf1aee7. 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/USX761216214 — a six-check JSON result.
Addio fiorito assil (from Madama Butterfly)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33e90b3757ab2ef1f6da82e618ddadd974763989bb76a4181ecee230f2fb9035. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USX761216216 — a six-check JSON result.
Sonata for Piano No. 21 in C Major, Op. 53 "Waldstein"
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7be34459bde2bb43c22d1fa47f235c0be290bca35757d721ea292cb34a05a677. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/USZGD1681503 — a six-check JSON result.
Piano Concerto in B-flat Minor (Introduction)
Michael Ponti, Piano, Prague Symphony Orchestra & Richard Kapp
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc049dd6e7f20632b39a10d4524b18441e29cd2c6722ca8d65a390cdd9b3832. 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/USX760800064 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5745173b232354cb9702806f8760396cc6dc81fcd2f28e9b935c26d09f9a4d82. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/USX760800068 — a six-check JSON result.
A Gottschalk Festival: Works for Piano Solo, Four Hands, & with Orchestra
Grand Tarantelle for piano & orchestra, Op. 67
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6718b94b08c592513227ccc7e3a8c5e95495a85a634fcfd3aeb2841a90ea899. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USX761413316 — a six-check JSON result.