David Stypka (21 July 1979 – 10 January 2021) was a Czech singer known for his performances in the band David Stypka and Bandjeez. Biography Stypka came from Dobrá near Frýdek-Místek. After graduatin
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 0x41d242589cfd6fcc69ce5f96aad864d5cdeeb6ee183384092637c48f9c714916. 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/66391041-e1dc-4ecf-a020-4e2d4c9ad231.json and https://artists.proofprofile.net/proofs/artist/66391041-e1dc-4ecf-a020-4e2d4c9ad231.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 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 0x046fac323124e9f4b70d25d554e13c21a423be4b91cdd7a90f71f15991c7fd32. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/CZUM72400781.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd00423e50b8efe448bad8ddfa17cabe24ff680d107fdca899f5471fea1e1c87. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/CZUM72400782.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa22b6b5167942eb7e1d5c9fa55ab43402867be61c8e09b281010a974d3c0fd6. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CZUM72400787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79e73c656e73adea3b0f3ea874122300cf9dfbaadc678d46fbceb1833ba7313a. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/CZUM72400789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b015b58e7d97b406990c6bc914e12d76dc99ea705f8789ab572eee2233b4de4. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CZW851900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7f7e474e9fac9c9615c50a71f38745893224b5edd679c6345e2c1c4f9bb6921. 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/CZW851900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d5ce6a4e3c90b754a3a115d3414c6038013277201415dddb9ac7292877c7528. Chain 2 (Bitcoin): anchored in block 958058 (2026-07-14T20:20:34Z), 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/CZW851900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21ecee8f71bd5f63b108949d7780f6b25dd7876720c141cc3ef3d7f92ddc1965. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/CZW851900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb30ec14d028507359f7550ba4c4b153e626d279d786f9791d141d0b3d970e879. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/CZW851900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9addafbc2519a1d99c4a828aa24e77e9bea5a999d5bd3b3804bd815725155654. 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/CZW851900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e0e95473d0b7ffbfafa0644ae2b9dd8f327b376c9442f033c676077fe95a0c. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/CZW851600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2bb7ccf4b10063a26625cb76c3f56720169146103964d2632cba2ca2cec0223. Chain 2 (Bitcoin): anchored in block 958202 (2026-07-15T21:23:21Z), 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/CZW851600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0398698d5c8418a709383f4bcf7d4917e4ef4bc8febaa008a3401c2dedf79b22. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/CZW851800010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a0ef7a8f364dd2ac943c081f87eff69060329b37618183bcfdcbde449940c50. Chain 2 (Bitcoin): anchored in block 957583 (2026-07-11T15:53:17Z), 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/CZW852100017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f20648cbaaa87df762d32f00ce3600e6d3698d352d033c9a8b7384d6841a8d7. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/CZW852500032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7743507890350c4022a96ef6289b0a90f755782b3aa9117976613e0920d8dff6. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/CZN732100048.