thumb|Hans-Ola Ericsson, 2017 Hans-Ola Ericsson (born 1958 in Stockholm) is a Swedish organist, composer, pedagogue, and visual artist. Career Ericsson studied church music at the Royal College of Mu
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 0x1675c4d09cd2de841bbdfb8b23f733469f7f7821e34969d924519d5a7af09bb9. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/535df555-437e-4467-ba2c-ab92f5ed7e56.json and https://artists.proofprofile.net/proofs/artist/535df555-437e-4467-ba2c-ab92f5ed7e56.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
Hambraeus: Motetum Archangeli Michaelis / Apocalipsis Cum Figuris Secundum Dürer
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 0x56ccd8b63c9bfa11b47578c04afd445be6ba0e39effcb041c24c4794ba1d96be. 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/SEAEJ9834010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50061efbb9d8337eebbae252b990c4cfbb473c2caec0f3d4fd020ee3b21f6a0b. 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/SEAEJ9834020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x158cbc46a0c27306dde2de7d84ce01462d1fd500c5189e2d0a005c15c1004989. 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/SEAEJ9834070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c0bd50eba69acf12bab8eecba409d6276735b0703f967a67b266bf0d26078f9. 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/SEAEJ9834090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb96ad7bb80531e44d60aa8468ee15bed9eaa07b520181c2a09ae466fc66b3535. 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/SEAEJ9834130.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46e92c44d1fec274622633b53bad4f6c52901f2e9b56d147eb7887a480e57612. 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/SEAEJ9834190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4eac0261f8e24732a4fa216108650cdc5cea04a3afd4efac29acb69eae01ce7. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/SEAEJ9834220.
Arvo Pärt: 75 Year Celebration Collection
Spiegel im Spiegel for Violin and Piano (1978)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1602588fcab73cca67498cebb49e5e987544be7d2322c1ea10605b6c3162c754. 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/SEWDL9822208.
Part: Spiegel Im Spiegel / Fratres / Fur Alina
Stockholm Gosskör - Live in Gustaf Vasa Church, in the Stockholm Concert Hall and in Italy
Messiaen: Intégrale de l'oeuvre d'orgue à l'Eglise de la Trinité de Paris
Eben / Plog / Hovhannes: Music for Trumpet and Organ
Hans-Ola Ericsson: Woehl-Orgel Concert Hall, Studio Acusticum, Pitea, Schweden
Royal Music for A Royal Instrument: Organ Music by the Duben Family
Ericsson: the Four Beasts' Amen / Melody To the Memory of Lost Friend Xiii
The 4 Beasts' Amen: Communion: Scala angelica
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x148dad4e58a687aa900e46f4d029757bf7a35d51a77aa9171511c9543092823c. 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/SEAEO0686080.
Schoenberg / Frescobaldi / Ligeti: Organ Music
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde97c09190bb194fdb246774cae4bb3c8ae64f0d0e3af50dc2531f3e158f5f0f. 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/SEAEF9309060.
Beethoven / Haydn: Organ Transcriptions of Music for Musical Clock
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81b17362d0156ed8c51ab0c2b97a502ed4d8f95adeef88849ee6d7ba39ef809b. 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/SEAEF9261010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75d7ff540f5251a914785e204d40ce3541a94b382ec67832b19ff11d8c747383. 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/SEAEF9261060.
European Birds: Turdus merula (Blackbird)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3cd7065a2b7cb69694e41c8c0c3bc656918728f87085d85bd19be3825980c069. 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/SEAEE9292080.
Birdsong Used in Messiaen's Organ Music: European Birds: Sylvia atricapilla (Black cap)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a0bf6bd1e785e158b3a3f7c03144628a53fc160cd578051b2568215a86795ce. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/SEAEE9292140.
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
Bach, C.P.E.: Complete Sonatas for Flute and Obligato Keyboard Instrument