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 0xc86c9094d1ba37207f7f47a17db920a1346d397106a0fc34752daf2cfc9d644e. Chain 2 (Bitcoin): anchored in block 953616 (2026-06-14T08:58:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/19b986fc-7a78-4f28-b6e3-8573b83245bd.json and https://artists.proofprofile.net/proofs/artist/19b986fc-7a78-4f28-b6e3-8573b83245bd.ots, the client at https://opentimestamps.org runs `ots verify -f record.json proof.ots`.
When This Cruel War Is Over (Arr. for Voice & Choir by Matthew Guard)
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 0xe37d66abfc7bb02e96a69ba703915286bde80463fba716c039c7977d36667c08. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USKC62427801 — a six-check JSON result.
Figure humaine, FP 120: No. 1, De tous les printemps du monde
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef02b49ce1676a4caccc916d776946b8a6ebe2fb136e2f0e9c26a980d85b49c. 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/USKC62427802 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2203afc29c725b1f45799c16341146a45f44d54ed149ca748ae58ae30481b8f2. 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/USKC62427803 — a six-check JSON result.
Figure humaine, FP 120: No. 2, En chantant les servantes s'élancent
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46c84f00e3670fdaedd4f409f2453ce8582dee6e764033b472e865a52b70b300. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USKC62427804 — a six-check JSON result.
Break It Gently to My Mother (Arr. for Voice & Choir by Matthew Guard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a629bfb0fcb9e3ccf22cae71d3461c10401f2cebe0f16e943a99d02e403b72. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/USKC62427805 — a six-check JSON result.
Figure humaine, FP 120: No. 3, Aussi bas que le silence
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x963458658d866afee660f35aa591f059179d5d9f2e47fda3a4d2aac8265e4c46. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USKC62427806 — a six-check JSON result.
Johnny, I Hardly Knew Ye (Arr. for Choir by Alice Parker)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e68cef1762214f1e1cf142f6b64f25a9b64c7f6db99b01ace82207f5079302. 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/USKC62427807 — a six-check JSON result.
Figure humaine, FP 120: No. 4, Toi ma patiente
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bd06406ccd216d009d676e215ef971f26736caa6bf6f321c4637617560e229. 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/USKC62427808 — a six-check JSON result.
Soldier's Memorial Day (Arr. for Choir by Matthew Guard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0dcafb7ac05aeaac5a5a4f853fec9698666e00fc7bf3b632188a4ce0fbb65a6. 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/USKC62427809 — a six-check JSON result.
Workin' for the Dawn of Peace (Arr. for Choir by Ron Jeffers)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24263b0957d567f5d06901c08f2416ab9958f6e056b36994cb9a755d3c90719f. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USKC62427811 — a six-check JSON result.
Figure humaine, FP 120: No. 6, Le jour m'étonne et la nuit me fait peur
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd5cc97fe8718448b4b6b49e4836f029dd446cba5e7ad5135122efcdb4cb6458. 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/USKC62427812 — a six-check JSON result.
Abide with Me (Arr. for Voice & Choir by Matthew Guard)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190eab50a8f7f9693513b005ea34df82f1b61dcd35513e7a312c246747b33748. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USKC62427813 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f1eabbb8b3dad69961229a664465e5faa55d546333c336545740c2282740ea6. 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/USKC62427816 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d34222f2b672e003ad9e88b5bc89ac6191271264f6bc86839e2001a0994e791. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM92170257 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc679656d9fd0271ede49c3198230aa33d9065a196f874bdcb261db2b9c8234c2. 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/USHM92170262 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635878c260be73525b88f8b3774584825a9525893f7ff944cff3d7f0988e9fb7. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/USHM92170263 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f76e7c56d78d844cc60dd7599867f67381d626daeb4ede043dfe54904c9354. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USCGH2019482 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd742e27e8a21afc7b00854f3993315ff823a576f7473689a90c34cc052e7cd4a. 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USKC61821907 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c51f459ffe119f0978d4bed9b4a50e1d3873d05144dd65f7aade50f280459e8. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/USKC61821912 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc96c17ff06fba40c15b25c78d01240caae02a45176ba402ff59d4097087a8630. Chain 2 (Bitcoin): anchored in block 960277 (2026-07-30T16:10:47Z), 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/USKC61620001 — a six-check JSON result.
Butterfly Dreams: No. 1. Butterfly Dreams: A Pleasant Hallucination
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89b08c2595f3ef52f5b19c7d22abc2aefb950839c0c3d08e7265479364790e4e. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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 at https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USKC61620002 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33d11d8f304419690fdd2ce9f7e57bfaed64caa548555a8027bf27515ad49bb6. 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/USKC61620010 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbb87b517fc7c106ca19a1c499cdf7047adaf6dd2efc185ac8b5e9650ec800ac. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/USKC61620011 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64a7003613faefa4d8204ddc858e33909b12cb5421ccd18e87319ea552ae7f65. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/USKC61620016 — a six-check JSON result.
Six Choral Foksongs, Op. 36b: I. I Sowed the Seeds of Love (feat. Clare McNamara)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x314234cea9fc8986b8b77abf29a7af0b1650057a15e03481a42a4bc41c5136f6. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/USHM21538673 — a six-check JSON result.
Requiem in D Minor, K. 626: Sequence: I. Dies irae
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4978068ce233771d3c9434f04051a0d488af637730e291272d5b1ea99234838. 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/USB8U1602112 — a six-check JSON result.
Missa Papae Marcelli: Masses, Book 2: Missa Papae Marcelli: Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x678e3a53a33f3982a7fa3ea27cf4b3b50ef9c615404808b36f849911e39e5756. 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/USB8U1602138 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x179be90e9193bbf7a048147ea3ede8bab1a5751795decf64ef5e1c0cebb9631d. 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/USB8U1602114 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d6dd3fc6abe42fb5e8beafc236fe4987cd837ed22afeec954f0b04c014f082. 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/USB8U1602121 — a six-check JSON result.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96e26788e888e319daea7e31ba908b04680d85bcd8b3f511b180400b856dd316. 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/USB8U1700937 — a six-check JSON result.
Walking in the Air (From "The Snowman") [Arr. R. McFarlane]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7b6ce3cacd711af35ace2abed214c528f6a862692ccdd3c2afd1ac985531138. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/USKC61721605 — a six-check JSON result.
Christmas Time Is Here (From "A Charlie Brown Christmas") [Arr. C. Nei]
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffe74fdd47e691d1f6e03093fc279ae9b68904d758ebe1eec1a20781a392d6e5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USKC61721608 — a six-check JSON result.