Michał Jacaszek (born 19 May 1972) is a Polish electroacoustic musician, often credited on albums simply as Jacaszek. Discography Studio albums (2004) Lo Fi Stories (2005) Lem Konzept (2005) Seque
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 0xe9b2a2bd947b4d52f702575d7500c5dc2050fedd7eb1025cc4275b8930e55ed8. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6102e277-37cb-4ef2-81a8-8e6c87504b32.json and https://artists.proofprofile.net/proofs/artist/6102e277-37cb-4ef2-81a8-8e6c87504b32.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 0x541b8075ecf12ec865f0efc70de582464a3ff0cf8327a77dade48476405475eb. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM4TW2219024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc34f9f8defbd9a333ccd077e8703cbe48ef17c4cc308a1ebd0286399b1ae411. Chain 2 (Bitcoin): anchored in block 958918 (2026-07-20T17:58:04Z), 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/USCGJ2090140.
Catalogue des Arbres (feat. Kwartludium)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81dd679df7706d1f0e2b53d4ff5078b3df83a829730e1acc6e14d491d6c46bc5. Chain 2 (Bitcoin): anchored in block 957892 (2026-07-13T18:21:16Z), 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/US2J71708103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x26aba4ffe1d0ac4bc8aa23169f85847d8966e3130b29db4be9d1b800bec0b4a8. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/US2J71708106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9afb444e08f412f63fcf6e4e01f3f0f59a1cc77e66a7a22692afc81e67f8afe9. 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/US2J72005701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90156c1b75ac5be7f8c7b46f8ff8070382668f7f77256df4ec1e2b342854038c. Chain 2 (Bitcoin): anchored in block 957892 (2026-07-13T18:21:16Z), 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/US2J72005703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2659dbf1fa94ace11bbfd55e5c1a2dc5e42f6015229a6161fca81a4cf8b7809. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T17:27:56Z), 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/US2J72005708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a42dc6ece857b1d3d2740a4d72278e0ccbfa15865d5d43ffac85199f8ecd30f. Chain 2 (Bitcoin): anchored in block 958526 (2026-07-18T09:09:53Z), 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/US2J72005710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6543f931471e433bf84f0618605575518cc2a37b01c8f0d7d6e442bb36b624bb. 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/PL98H2305003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9de7f8cff9684f3479f80e2942bed637a21b561dc7d486c2ac618d0a9d79606d. 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/PL98H2305007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b8fe4b320901b0268c90be69d85bcbb624a8119ad142ebba70b9c147ecac998. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/PL98H2305001.
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 0x4e658b89f58bf466fa3d1a9b34afa7f9abe2af7b468e106ed75eb5ea59795a2d. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL98H2305002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90fb7e55d714865f9e2669e67b89c21d128a77664c4231ee5f34f4e3bf59e431. 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 via https://artists.proofprofile.net/api/v1/bot/ots/verify/track/PL98H2305004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02aeadb1f7d503d10d1c5f440538d8998858a5af04b3c8ed43faebe72e8f0fa. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/PL98H2305005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef43422586df63b7e75556aab5eb8dbc7152c20ea44500285e416f35b5ff907. 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/PL98H2305006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd9a283213d6f02fa24a51b654475708edeeb610bb8794ef69dd2e4172e8455f. 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/TCABS1383545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9100e383de8513ce9de45ad11dfdc6583fbb11dd566f5829577cd8883833988c. 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/US78L0910059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x665ae371bd950fc743b8bd61888daf966a657c79cb79431738cb16ceedb79947. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/US2J71104708.