Matzka is a surname. Notable people with the surname include: Ralf Matzka (born 1989), German cyclist Scott Matzka (1978–2018), American ice hockey player
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 0x8267426cf66812acc8dc69cfe679ca4681dbf374bab299c4727e9e891b8fa42f. 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/1136c33b-2ba4-44dd-b82c-ad7b1cbac4a2.json and https://artists.proofprofile.net/proofs/artist/1136c33b-2ba4-44dd-b82c-ad7b1cbac4a2.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 0x2a58051f6a5ece88a3745c8634fad3e4e8898757ca5bdb8db26d56b7c21165e9. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/TWY311501001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44719808fa38a64d27092773ca91a150a84fe63fa4dec2f32eb125fe7707243c. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/TWY311501002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebd2c0a184c5f7a3b83b5f97fc92ecd5b4f36d86b537e601527077d280712369. 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/TWY311501003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb92f8bd7033ffc2e07edc027f86193f8310d7021ab13c1afafed04ad6da8a822. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWY311501004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b1b6e8317e46ba1a6a313905fcc7d94dfcff34f666bf4d604ce308bd49ed6dc. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/TWY311501005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x939413d438613dc946d8d3b9041c44ac1a32ef338ff63be8387a9abe618d2bde. 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/TWY311501006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44a6f1fa086180d75086b4ea2ac212ee97eeecc8cd0560e0721aa719b7fce3a. 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/TWY311501007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bf9245c0bbf840804d0b4fb83edbba65ad6b255b3ee9255ab3b8c4fb13756af. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/TWY311501008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0211715fc90535993de571d17fc232191f209c9a13f4f3fea52e2c91064389a. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/TWY311501012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3c6c4819866304e0f0f0a90fb714810469f0aee75ade871aa6dc32238c0c216. 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/TWY311501013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87824589d3f6ad814419158a7c1fbdc4cd4bec3c8b5cd35348d8c020c54919f. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/TWY311501014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda9c64e161f61865e3aab32210cb069d9fc0a7b0ffa79eedbcc887fac74a4b1. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TWQ931900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d55f1f8e53ca2b582be4f1f46d334172f115f7b85f6c8e051b203c7cd90cfed. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/HKG731680983.