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 0xcf2f8a37bab77dd659526c9d0ce0127dfe4d45b48d99a1426a35644fee77cec5. Chain 2 (Bitcoin): anchored in block 953407 (2026-06-12T19:24:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1e63b260-e042-4be6-8c49-6c3ceaaafa09.json and https://artists.proofprofile.net/proofs/artist/1e63b260-e042-4be6-8c49-6c3ceaaafa09.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
詩曲◎チゴイネルワイゼン～ ロマンティック・コンサート
ヴァイオリン協奏曲集「四季」第１番 ホ長調「春」第１楽章 アレグロ
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 0x0bd32892284efec6dffdfb5f3650741eedf3b6933fc257c639010cc37b66e3d4. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/JPVI08908610 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d83571a0f4170ed8b8acd5a0892445dd6f24525c7bcbf41c9e5e6fd50d69852. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPVI08708460 — a six-check JSON result.
ベートーヴェン＆メンデルスゾーン ヴァイオリン協奏曲
Beethoven & Mendelssohn Violin Concertos
千住 真理子 ベスト・コレクション
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3495ba4b5a36f08eb670064507165343eb9962bc0860f076696afb6bb3d4d58a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTO00701517 — a six-check JSON result.
心に残る３つのソナタ ～フランク、フォーレ＆モーツァルト・ヴァイオリン・ソナタ集～
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad30a2da2045062213917634f35e9f6d1ae9aa368c6ba4c472b15e108662c13b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTO01101047 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90b14b1fdbc1c75a153d6102e71efe7e4e2a812edec3c4936ad5419068373e4b. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTO00301145 — a six-check JSON result.
アヴェ・マリア（千住真理子・山洞 智編）
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c6f1c8cc58bd5077262cda3271bbf2c2d6b8f1083ea3e28cfe4f73cdcf20fd1. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPTO01101134 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f9985ccf95c070148ee29fc72557c5e359d6c974dda0b90295963b51d2ba45d. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/JPTO00601840 — a six-check JSON result.
Mendelssohn & Tchaikovsky: Violin Concertos
Violin Concerto in E Minor, Op. 64: I. Allegro molto appassionato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ba6d6d531fcf9db5e069460a650050a7e75bfc0fc0412a9b32cec8a563e540. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/JPPO02405369 — a six-check JSON result.
Violin Concerto in E Minor, Op. 64: II. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba40459aded703ad154bb3b8c130627f43710eb63d143d668e794d1cfdae389. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/JPPO02405370 — a six-check JSON result.
Violin Concerto in E Minor, Op. 64: III. Allegretto non troppo – Allegro molto vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92aabde09f27743081984c93c63db962108e3bcd6713b31089adb49205383b1a. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO02405371 — a six-check JSON result.
Violin Concerto in D Major, Op. 35: I. Allegro moderato
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x569f66905f6247df527a529535c9ec90919c04887c826daf0738d20fe5915e92. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO02405372 — a six-check JSON result.
Violin Concerto in D Major, Op. 35: II. Canzonetta. Andante
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80df62d1def447b07469d82d75c69c5a4c87b61b8d2cca2f035db8065b7c7187. 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/JPPO02405373 — a six-check JSON result.
Violin Concerto in D Major, Op. 35: III. Finale. Allegro vivacissimo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb393f650bf887094f582f9b3133673bc877f999863528e58f35041dd1ce9f79. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/JPPO02405374 — a six-check JSON result.
メンデルスゾーン＆チャイコフスキー：ヴァイオリン協奏曲
Ongaku Kenkou Yuuryouji 2 Sawayaka Egao no Ongaku -Selection-
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d83571a0f4170ed8b8acd5a0892445dd6f24525c7bcbf41c9e5e6fd50d69852. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/JPVI08708460 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241077acf65c3db9757f70d58aed5b6c56ef00ae94fadbec590f6b05830b8429. 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/JPTO01202580 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf91cb4ab9a83fca737f0d636f896f6b8090e4438bea1e540bd107f547225a52. 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/JPTO01202583 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f0915be5b842117bc2429af6c2b8987bdd9a29b854ba8254ba95873dcd0415. 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/JPTO01202590 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x130975b576cdbccf0a7a2fa812d29556319b4c89f7e78029fa3cfdd9d96aa99c. 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/JPTO01202592 — a six-check JSON result.