thumb|383 Madison Avenue at night David Magie Childs (April 1, 1941 – March 26, 2025) was an American architect and chairman of the architectural firm Skidmore, Owings & Merrill. He was the architect
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 0xc525850b11217ca31860dabf5a2606bb4b836263444f9f38915917362092e651. Chain 2 (Bitcoin): anchored in block 953741 (2026-06-15T04:44:49Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9dca186c-c752-4c0b-847a-59280d15c33d.json and https://artists.proofprofile.net/proofs/artist/9dca186c-c752-4c0b-847a-59280d15c33d.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Concerto for Euphonium and Orchestra: I. Dialogues. Allegro agitato
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 0x3e9f3f3fef747d464497fe12f7299b66f69a251bb2c8f172770d38d51ddcceb2. 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/GBLWD1905004.
Concerto for Euphonium and Orchestra: II. Song without Words. Not too slowly
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc63ab54e14045d6adc420e279997f741653cdbee517780b4493ea90d8e9d5ac. 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/GBLWD1905005.
Concerto for Euphonium and Orchestra: Cadenza - Allegro con spirito
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x767274501fa13c2ec4d099e2965ed2aafa2514e6376a68e26bf2ebd09f49d0f1. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD1905010.
Concerto for Euphonium and Orchestra: I.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a6bcb06aa35cd9467793622d85354d011f74b8118e5e838e6425bf2f1aa0aad. 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/GBLWD1905012.
Concerto for Euphonium and Orchestra: II.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b29de6e92a09185c0aa5d1d0678a0938f96a4f445e7938770ff82b39462323b. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBLWD1905013.
Virtuoso: Music for Euphonium & Brass Band
Zigeunerweisen, Op. 20 (Arr. for Wind Ensemble by Jonathan Bates & David Childs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf1ad8556466dadc5f620fd29255f4659873d48b541e2387360345d1b2acdf1f. 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/HKI192439401.
Danny Boy (Arr. for Wind Ensemble by Karl Jenkins)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1193e095bef8fd07e6d9d11f2a448fcee0624d3971ffef0f19d92dc42cab17b2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439402.
Il barbiere di Siviglia: Largo al factotum (Arr. for Wind Ensemble by David Childs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6172d2c80ae5513a1f4ce3a9350def2647952e19cbad4a89be531d6dee7492c6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439403.
Adagio in F Major, K. 580a (Arr. for Wind Ensemble by Philip Wilby)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2afd12617261757cb4ed7c54bce5d460dd1dde4bcec9ca1f2cc224604eddd17c. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439404.
Piano Sonata No. 11 in A Major, K. 331 "Alla turca": III. Alla turca (Arr. for Wind Ensemble by Robert Childs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff1d7412a74881c7c842149579c5123a22fbfb701dbf0c3d986afefa69c86e46. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439405.
A Little Prayer (Arr. for Wind Ensemble by Robert Childs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf476a3f3ff7eada61d8923e71c32ab2bf806a3b5cda02c191a6e38db25b3e018. 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/HKI192439406.
Fantaisie et variations sur "Le carnaval de Venise" (Arr. for Wind Ensemble by Alan Catherall)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98700e1ed0bade19ae94254ded60fcfe7419d4e62a366c4e76f24af602ffa114. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439407.
Hamabe no uta (Arr. for Wind Ensemble by Alan Catherall)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc82b97079fee67ed3e33dd1ebe5d310b6d54b7c2fd4029844f3d1783838b7bb. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439408.
Facilita (Arr. for Wind Ensemble by Peter Graham)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ec8d4ed319df2862d70eb4e16f8cbd81f01758e3548d1f5774d9b13c69121a. 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/HKI192439409.
Elfriede (Arr. for Wind Ensemble by Alan Catherall)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb55a4e3bd1c236df36c88f45ad4027c2571e0b44e45b4b563d63ad012877b23d. 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/HKI192439410.
Variations on "Believe Me, If All Those Endearing Young Charms" (Arr. for Wind Ensemble by David Childs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37192553039f4fef230ba478c94752bff6b3a6eeab3fddfcd053c7d0cc1cc416. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439411.
Macushla (Arr. for Wind Ensemble by Dan Price)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1efdb10e7f76a1d683d71e1026d5c5e418473137d0d182535928e4700dae175. 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/HKI192439412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de5ccc7e8eb7dca39dc9ce2017f85973d8e1a85353fc53be45bc1e774447022. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/HKI192439413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40bd893606a60caae525a62e3a35b1a918656c05c7f7af4030ab1ba962ed7727. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/HKI192439414.
The Tale of Tsar Saltan: Flight of the Bumblebee (Arr. for Wind Ensemble by David Childs)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4a0fcd212d6eca858d52cd9bb73aa9bbe144386ef0851af6d9f9c164dea7c3. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/HKI192439415.
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 0xdb9f62e19cc751fe76ed25aca982a9069dfc4d692acdae67e445b4cb6d0ba6c6. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/CH6541746930.