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 0x9a403fb84abcc01a7050d3f4e2e74461ca0650da7035e2e5221bec30192acdf6. Chain 2 (Bitcoin): anchored in block 953697 (2026-06-14T21:49:28Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/60957900-2302-4b18-a282-71975f349fc0.json and https://artists.proofprofile.net/proofs/artist/60957900-2302-4b18-a282-71975f349fc0.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
String Quartet No. 12 in E-Flat Major, Op. 127: I. Maestoso - Allegro
Beethoven: The Late Quartets, Op. 127 - 135
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 0x521a8ea205aae53416c29294adf99391547e1392f358c4887061e6f6d82a9d3b. 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/FRZ131711010.
String Quartet No. 12 in E-Flat Major, Op. 127: II. Adagio, ma non troppo e molto cantabile - Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa13149a8bc421b21b416ac15c1d12cb13d18650d70e305c1e4e1d51fd8ef78f7. 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/FRZ131711020.
String Quartet No. 12 in E-Flat Major, Op. 127: IV. Finale. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x474f0e1ef147e118d286043c96a81eb4c9d1e5ed66236ac9fef76e677832dae6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ131711040.
String Quartet No. 14 in C-Sharp Minor, Op. 131: II. Allegro molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x701338e860f2ca0c46acf21c1687496a7f4c4f5017184be15b054e228d28869e. 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/FRZ131711060.
String Quartet No. 14 in C-Sharp Minor, Op. 131: III. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x054e93eed7efc75873ec375a467a60fbd21b9e87cf8453fb434815945a8d5ea4. 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/FRZ131711070.
String Quartet No. 14 in C-Sharp Minor, Op. 131: VI. Adagio quasi un poco andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x853bddfde9bfcd3f23317dcc2a10d36ff14cdebcbe54505b8330512a56a67147. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FRZ131711100.
String Quartet No. 13 in B-Flat Major, Op. 130: II. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c3244b84117d071fd977a997142132c7e6d7b3c94123582bcab7267b54be6c5. 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/FRZ131711130.
String Quartet No. 12 in E-Flat Major, Op. 127: III. Scherzando vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e17735c4bad8fc30c2841dd82e8432b6f72c57379455d2ddf9e0a6abdabaa72. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FRZ131711030.
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
String Quartet No. 14 in C-Sharp Minor, Op. 131: I. Adagio ma non troppo e molto espressivo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbae662cf0d0882781cb09744947dcca0a3163269faa340b8af34a53399597fc. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/FRZ131711050.
String Quartet No. 14 in C-Sharp Minor, Op. 131: IV. Andante ma non troppo e molto cantabile
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x689244b527509a53d44fa797e1c42f5d0567992d431e48420ce1b890a26da948. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131711080.
String Quartet No. 14 in C-Sharp Minor, Op. 131: V. Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x069b1a2a74f5e50a995aaefa112a2d5ae92bc1f170b9590f1afb8f8d2331b40f. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FRZ131711090.
String Quartet No. 14 in C-Sharp Minor, Op. 131: VII. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf03ec3e9b5564942a14f73c3c1556ad26c80eb1b085a14fcbd8a1ef6cb69b9d1. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/FRZ131711110.
String Quartet No. 13 in B-Flat Major, Op. 130: I. Adagio ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf2990241bfbb2b2dd6e5544e14ce06d47bc3d553dd9208c57fd595f1a94cad. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRZ131711120.