thumb|right|Members of the Kronos Quartet with Paul Hillier (middle) in Malmö, 2005 Paul Douglas Hillier OBE (born 9 February 1949) is an English conductor, music director and baritone. He specializes
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 0x972ed88041a380389dbe301d076da6d35e87637cb29041135d50957fe00bfc88. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ad7b5eb1-d640-49b4-93ed-6f852f483728.json and https://artists.proofprofile.net/proofs/artist/ad7b5eb1-d640-49b4-93ed-6f852f483728.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Psalms of David: Psalms 1, 2 & 3 (Happy is the Man)
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 0x61da210da8f3b23efd1dd54fc84d55213ae4d03b79f34e56de40b8b0fe4c38b6. 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/USHM10231102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x145710c2434465e2c945094a5551880d7df0c994a78f0b2f08277df41b6343c9. 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/USHM10231105.
Lorca Suite, Op.72: III. La luna asoma (The Moon)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d140699564ada7e60511674b9472045c98d4aa59dfee97aa4d7484b4768e25. Chain 2 (Bitcoin): anchored in block 957041 (2026-07-07T13:25:45Z), 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/USHM10231108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4e09859ef9e7d4464098164064d4dd49fb181d49675365f384334da592da774. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USHM10231109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4cb702e1baa259cfca0ee5cfca2822268913ec9a768c82470f5c08dbde4244f. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM10231117.
Early American Choral Music, Vol. 2: Anglo-American Psalmody 1550-1800
Chester ("Let tyrants shake their iron rod")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf275a3fc1f29a2af9f81539a3b7598b667d82c2ae601a93c77662ee17e2191f2. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/USHM19612810.
Amanda ("Death like an overflowing stream")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f608250458b4ad458aa35abb629233dfb216b1a0ddbf5fb768b9b4f37321031. 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/USHM19612814.
Windham ("Broad is the road that leads to death")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7774461b499cf19244154dd0946761d84e9eefe4588761d0f9d764e87d234d80. 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/USHM19612816.
Rainbow ("Tis by thy strength the mountains stand")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50e6dfab56903be423028d93d37700ba6fc156896ae5d5edade6d17057fe7719. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM19612819.
Evening Hymn ("The day is past and gone")
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d0cb6897fe72b074574b116695b082b8dea9b1b62fa19535ac2382368f1bae1. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USHM19612823.
Viderunt omnes, Notum fecit Dominus (The Notre-Dame School, 12th c.)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4831d8888eba08c44eb6eee9fdea514203558a142bc09d6eb33a8892ec0e69. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/USHM10127621.
The Natural World of Pelle Gudmundsen-Holmgreen
Pelle Gudmundsen-Holmgreen: Green Ground (Live)
Viderunt omnes, Notum fecit Dominus (The Notre-Dame School, 12th c.): Viderunt omnes, Notum fecit Dominus (The Notre-Dame School, 12th c.)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef4831d8888eba08c44eb6eee9fdea514203558a142bc09d6eb33a8892ec0e69. 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/USHM10127621.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 1, Vergine bella
Palestrina - Twilight of the Italian Renaissance
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d398cdb18c66854c6689404c3674ceb0c9e0d83ebb0a6ddb2a7a0b335d24190. Chain 2 (Bitcoin): anchored in block 957052 (2026-07-07T14:50:41Z), 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/GBAYC8401313.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 3, Vergine pura
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44c07a4d507e84651b2d04eede30c051ea7a1c6c3ac2e6b01502c556c4f3e29b. Chain 2 (Bitcoin): anchored in block 957065 (2026-07-07T16:43:21Z), 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/GBAYC8401315.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 7, Vergine quante lagrime
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5f008b3388c6fbb6066cea5c20f71f58bbf4bf400a574274a2efd895649c9c3. 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/GBAYC8401319.
Palestrina: Il primo libro de madrigali a 5: Stanze sopra la Vergine: No. 8, Vergine tale è terra
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa827d87022ba5b47dd1c29232005457612b707c3173fa7d67732571416b84986. 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/GBAYC8401320.
Mass for 4 Voices: Mass for 4 Voices: Kyrie
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcce6e10dd797959f0a9e15805e8d94c4dbefa2eee0cd01e6e7a25ada8fff29ee. 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/USHM10022301.