Per-Olov Kindgren (born 10 June 1956 in Bogotá, Colombia) is a Swedish classical guitarist, composer and music teacher known for his classical guitar playing, ranging from Bach to The Beatles. Biogra
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 0x46278e65396764eb859044faa8bcfa53f4417b7ba5cc9e4f0746d3f51c08cb94. 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/c4a99dde-b033-4f7f-b18c-e845c71a3a61.json and https://artists.proofprofile.net/proofs/artist/c4a99dde-b033-4f7f-b18c-e845c71a3a61.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
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 0xc0e77bc3dc746a28d21a4f825317ca1b80985884b2ea70a10a65119516ec7879. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/DKEW30700102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781b36bd4c10be5c13baec11f7e00af66286f24231cd2666e91a1e7e3ccb0a3f. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKEW30700104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64c55ac228ead18457a06a24db9b70720e600115579490db9693ea629dd10c0c. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKEW30700105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0909c93dda3b56584cff34b4ec32e97689c6613db1ececf5043bcd8856975d. Chain 2 (Bitcoin): anchored in block 958726 (2026-07-19T11:47:20Z), 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/DKEW30700107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90f40dfa4a6f24ed287124a0a2d6ddf147161d7e7579316f3e700e0a294805ff. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKEW30700108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41d15d5d6dc9cd86e5972d0e71ec58119d3981920a079b5c822b48cc0ef32cfa. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:50:42Z), 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/DKEW30700109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e0aea99ddcc507f6c57f7e5570e540a04db5a984d5929bca5377c4faf22a031. 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/DKEW30700110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46ffbe7a79289ddac9167d00966d49900601f8cdc570e6c85a03cc6b0587317a. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/DKEW30700111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf74a1c864ca7e0528ca7b184cf72e5aeeed6d410b9682945e95dd802db918013. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/DKEW30700112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x446b3a9f6e3e91ffee527ec8fcf1addee3796b0174d7f2886afba6f5b7666579. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/DKEW30700113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bf182bd87e82535eca285c4caf89fb55172f4623f690ab94afcffc91fc0aed2. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/DKEW30700114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37c894816eff9630fd7b477cc3122340a956b828993360fe04d02a14db27ccf1. Chain 2 (Bitcoin): anchored in block 959031 (2026-07-21T18:31:33Z), 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/DKEW30700116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59e09a5051d9bdd6693ad51b53fb7b70d644d8032ec33c63e4063f8d42f802c3. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/DKEW30700119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x812c6bd74140dde107121086eb3781a93310a61c2d35b05e8f521a39b35ca2ac. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/DKEW30700122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81f3ed7df56f5b21898338bbd744d3084a911eb631ea5f0959e00307c8da704. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DKEW30700123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b4ef5dbb37c1fe5943051ee47bbddb52e9d8c434974231405e8a7fea53a51c6. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T20:02:20Z), 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/DKTQ50908602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee9bea9af17411de9e854eaa95b1b027c87327cd8701a56bae20bb75c6fb39b7. 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/QZK6N2338853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ac77f2a498471379cb5042a01b3cc28fba02cbe38d74c9886f842c9d9c159e1. 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/QZK6N2338854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08543ff011011ae8c176a8dedb6259da487667bca7b0fa1d69552da1558595f2. 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/QZK6N2338855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49ebc0890d712f913f04f6b512b2ae9a14969c666189f42fec736108b4efb183. 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/QZK6N2338858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2495b5d9d4d04276c3822bc4634964672944bbbdc2761c4e3dd7f32486f6f414. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2338859.
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 0x0c0f8452541a9a495baa4fa107d59eae4cf97d86e4b6047d0ff3935b58cec47c. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZK6N2338856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff6f4268c0d7d92bc1ef9439eeecfa578c192412132505c606fde6a2996b4c3c. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2338857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57665fcac0816ac4bccbac3cfd527492c4618162ca31bdebb8db2c2c91d245b. 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/QZK6N2338860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f40623e623d4a1b4142e11e17d0ec6a419fff43b6f77a922383f9681c427393. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZK6N2338861.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe613100c8c1be73ca628ef0c40af0470ae90c7435cfd4849942ec2400b73eeb2. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2338862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4926f2a63d8cfc57ab26b65b2591f7a4944bdbfb11c1cf9f6e510f7b20378d1. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZK6N2338863.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x647196c8225051475bacf2bc5e932d9dbe9fe0d2ba1e40b616f8c5fcfaa2a27f. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/QZK6N2338864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa447dbd0c29ffb77b8f1f54edf3dfbe6a727eaa1e8f92515b426cfa583263b24. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZK6N2338865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99854140a2339bdb2391a517bc73e64cd29374fc85af3eb6a18b2cece9d0b3d8. Chain 2 (Bitcoin): anchored in block 960419 (2026-07-31T15:20:33Z), 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/QZK6N2338866.