thumb|Hortus Musicus in Luxembourg, 2008 Hortus Musicus is an Estonian ensemble that was established in 1972 by Andres Mustonen, a violin student of the Tallinn State Conservatory. Hortus Musicus spec
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 0x501fcb5c28d49df5e44930eaa47ca59c2b7d609435d9ced93e2e2e77f9196995. 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/f8bbe79e-e3ab-4c30-899f-3268a2d8b25e.json and https://artists.proofprofile.net/proofs/artist/f8bbe79e-e3ab-4c30-899f-3268a2d8b25e.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Peeter Vaehi: 2000 years after the birth of Christ
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 0xe90123ea3dad0f8df58ee196f9572b18e4b66b4a57c94eb317f6da048e48e3a5. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/GBAJC0500420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3055ffb59d2bb7e3d7169576d9f85f29b84beb03226216c9fc84cb217effdcad. Chain 2 (Bitcoin): anchored in block 958501 (2026-07-18T05:33:04Z), 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/GBAJC0500426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc797945ccc07642f9644e75c83e0e8a94a942831f6bdde5f987b54fd8bf8f4f. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/GBAJC0500429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e365b01bfc763652eba01a2d04806785a185f2557cd11cc077e25b93dcb5fcd. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/FRX080400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce59b918475acdc9086ec7ef0cb7fbdac22cc961dff4aa4fb50e46fe6f07058f. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX080200141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95a49b8d766ec4a05d1ba5f21b2be43c9a1849d25a0fb4d994229f9c2c8aeeb2. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX080400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc886d2fdff5fbe77126b7d3b6b83006f992b8fe1a6942d26f7459f8ed2dc0a61. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FRX080400083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8423d94595c2a3c017b729950758f51cc172008b0cd0e15fa8a61034b303184a. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/FRX080400086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8d6a7ed2f1f8ef5e2784d6a4fd107df04b32d6729285b4198db730fbe28004. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FRX080400089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a020d8a7a6edb3bdbd76b77a977a356bac9dc77870c28b01e7a1df40f65ed2. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/DEB379604900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x408e59743ed4752f67a5952014a001b393e49182843052878b700c3cbe3a0f04. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/DEB379401450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81764b05b6a463a47042c352e026bdcbc5c87d3bf1f0705e976e4bddd0a7105a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/FR6V80701656.
Monodijska Glazba U Hrvatskoj Od 10. Do 12. Stoljeća
Canto: Italian Music of the 16th & 17th Centuries
Lycksalighetens Ähre-Pracht – Musik i Sverige från medeltid till barock / The Splendours of Felicity – Music in Sweden from the Middle Ages to the Baroque
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33dffdd7e0e222a0d73bd9115befef2fdb230f4e0f18e2933d2f3aa1edbd67b6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/USB8U1042228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb882ce98d6549d924d498e510af8a60c1dd13a79536d3ace524f2419b15eb6f. 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/FRX872399415.