The Washington Chorus is a symphonic choir based in Washington, D.C., United States. The three-time nominated and two-time Grammy Award-winning ensemble has over 200 members and often performs at the
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 0xeca732dd733710dcda47fd15c256d3ac4467957c78ce0a58a5843fe74118482d. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6b2b3ad7-b658-4631-b7b9-ce2d80f7bb87.json and https://artists.proofprofile.net/proofs/artist/6b2b3ad7-b658-4631-b7b9-ce2d80f7bb87.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
Symphony No. 1 in C Major, Op. 21: I. Adagio molto - Allegro con brio
National Symphony Orchestra, Kennedy Center
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 0x4fd6fdf3db4d7099521c43059e483836019caeae655904ca0ea6baa9b9ad2220. 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/QZJXY2401301 — a six-check JSON result.
Symphony No. 2 in D Major, Op. 36: I. Adagio molto - Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea866a88f8c0c0cb2d8ab35323542a991c809f37e454b0f8d5f209ff23bd473. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJXY2401309 — a six-check JSON result.
Symphony No. 6 in F Major, Op. 68 "Pastoral": I. Erwachen heiterer Empfindungen bei der Ankunft auf dem Lande. Allegro ma non troppo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97c3af164e1e4a29722fc8a31057b2cc0b6dd4cef1deb70fff40d5877dc24779. 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/QZJXY2401325 — a six-check JSON result.
Symphony No. 9 in D Minor, Op. 125 "Choral": I. Allegro ma non troppo, un poco maestoso
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaddb7010bd865c96f09c703c125e26b567caf23ab40f652538443dbfd4e0502. 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/QZJXY2401334 — a six-check JSON result.
Symphony No. 2 in D Major, Op. 36: II. Larghetto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80ac396ca78bd2f8d8b1ede47eb2de38e81f3922d1b692dc421920bc7d00175e. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJXY2401310 — a six-check JSON result.
Symphony No. 6 in F Major, Op. 68 "Pastoral": II. Szene am Bach. Andante molto moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5645e8ad68d35025e8ee5e52469dae112019649b5151f328904faa83521200eb. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZJXY2401326 — a six-check JSON result.
Symphony No. 9 in D Minor, Op. 125 "Choral": II. Molto vivace - Presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98f63b932818b1d1b640553615577f4210d4b4cf0cf40987995518e060d1af0d. 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/QZJXY2401335 — a six-check JSON result.
Symphony No. 1 in C Major, Op. 21: III. Menuetto. Allegro molto e vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3d1d8bc76d398efb8b849074f1853a4e5ba3b3a03701fbc54ad9ae87ffd34ea. 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/QZJXY2401303 — a six-check JSON result.
Symphony No. 2 in D Major, Op. 36: III. Scherzo. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b5a44e0c72d0d4cd0a5ec64d197699f9ebb5ca56cb91a77dc6a6b8750870db0. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJXY2401311 — a six-check JSON result.
Symphony No. 1 in C Major, Op. 21: IV. Finale. Adagio - Allegro molto e vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11225f68cdb6eacee3a131c25cc824c3c13fe4af86b9156274d308d8a7c5fcf7. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJXY2401304 — a six-check JSON result.
Symphony No. 9 in D Minor, Op. 125 "Choral": IV. Finale. Presto - Allegro assai - "O Freunde, nicht diese Töne!" (Ode to Joy)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c07e7c9ad46b3508227ca12e24e4c225b0e7484b09074739beb06be1d5d9133. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZJXY2401337 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55 "Eroica": I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0cc1dbb261e31830bfed26ad953c0b7a64a01a6398556aa62a7106aa7018f0d. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZJXY2401305 — a six-check JSON result.
Symphony No. 7 in A Major, Op. 92: I. Poco sostenuto - Vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80d3a59d0586d6bd8f1a984663737fc41b7a77e862a09873e506a9254b8ca301. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZJXY2401313 — a six-check JSON result.
Symphony No. 5 in C Minor, Op. 67: I. Allegro con brio
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a854878372ab778c154be4679fcb3fb306b9475b35f29ff2ae5b9affa13be50. 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/QZJXY2401321 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55 "Eroica": II. Marcia funebre. Adagio assai
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf085ab058ef38f8a1f905db6bda7dd337586a46a96f3b96ebad891fa7f02bf0d. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZJXY2401306 — a six-check JSON result.
Symphony No. 7 in A Major, Op. 92: II. Allegretto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x112c960f2348e2f511287250cce30ccfda8d5d1dd06da0cc66a14506c22aee92. 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/QZJXY2401314 — a six-check JSON result.
Symphony No. 5 in C Minor, Op. 67: II. Andante con moto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45cc4e3e66c1127cd1615616ccc944ffab585bba176b19493390aef0afd24ae. 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/QZJXY2401322 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55 "Eroica": III. Scherzo. Allegro vivace
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc9c220d1060a798133e086dea7bf0613a1d6e548a5fa061482edb55a04be963. 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/QZJXY2401307 — a six-check JSON result.
Symphony No. 7 in A Major, Op. 92: III. Presto - Assai meno presto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5138e1d0f33aabad881d2d7ec3d38ee89570702d93f33e1ab12320ab554a6ed4. 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/QZJXY2401315 — a six-check JSON result.
Symphony No. 3 in E-Flat Major, Op. 55 "Eroica": IV. Finale. Allegro molto
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf487942a997a02512afe16a14ac9ca61da8048a02f2ecff17f560f143b461ac. 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/QZJXY2401308 — a six-check JSON result.
Symphony No. 5 in C Minor, Op. 67: IV. Allegro
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd88ad1c3cbf038fab541d5ce797a615953987f162758b047dcfeaf80fa14896d. 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/QZJXY2401324 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede7953705348d31966f90024cfc439201ea3efc4843fd8471a4098f8adee171. 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/QZJXY2301201 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd27cfd8db4fc7ba9bd86951ab0bc53e800e1cd3cfef7a883f7359d3a2e2be5c2. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZJXY2301202 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6746052fb3a1718df0dcd3ae7d38ce05a609930b13b4e40beb933a06f9293927. 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/QZJXY2301204 — a six-check JSON result.