Zahna () is a town and a former municipality in Wittenberg district in Saxony-Anhalt, Germany not far from Federal Highway (Bundesstraße) B 2 and about 11 km east of Lutherstadt Wittenberg. It was the
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 0x67a7b1d9d44d9ca8f6d464799cf962a0437a471f37dda8fb5673f4743d77e946. 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/c33687f6-6132-47cb-985f-cc95313c700f.json and https://artists.proofprofile.net/proofs/artist/c33687f6-6132-47cb-985f-cc95313c700f.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 0x98507f6ec68ff4daf28c004bb25c741734ca3f1f688e64638f748c1c400f1d21. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZCKC1800011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24148d13dbbc320654f70f52aa6588050a8be07b537b019c4dac59a87f452b82. Chain 2 (Bitcoin): anchored in block 958913 (2026-07-20T19:43:32Z), 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/QZCKC1800012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dde14a47f78eb5ee1369833b568781750c63c621218fb6030e1da3611b506d0. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZCKC1800014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362bf066e6422a62fd181dbc625ede23fed97ca375551475335b97761ca819ba. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/QZCKC1800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03146c74ea2e9807dc23274901873cc99e92392decda47eb236c39cb7f0d5590. Chain 2 (Bitcoin): anchored in block 958839 (2026-07-20T09:27:42Z), 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/QZCKC1800017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0c8d15042295926b4ebb9b2d1debd18349d446f0e9a2a92a4421ec3583e2b1. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T02:14:43Z), 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/TCAFI2008351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6565af7afd366a4f83793723e806d40f33bff85cf8f9e12908b7e60195f3aae. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZK6Q2199558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f98cfbff1e4a688fc6388568a14a0f124ce53f033829d9b333eadae8050a16d. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZNWQ2172855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df475165fb80ee2b3e237d855bea29f2b5a6d94d7eb1c853a51772fce0f22df. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZTAU2225932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb1f5022cf8f21960316c9c49b43630dde105f17c234203a511396754e4d4b34. Chain 2 (Bitcoin): anchored in block 957888 (2026-07-13T17:43:59Z), 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/QZTAU2267641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f98cfbff1e4a688fc6388568a14a0f124ce53f033829d9b333eadae8050a16d. 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/QZNWQ2172855.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x568d375a5bd0c5964e557f3cf44e2e880be679aec415e4305de2f9540d8093af. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/QZHN62285535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2efdd5c6d101fbc1cf7f3cd73919775415d1c2482cc9c9d7add181b239a9f1b2. 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/QZTAU2267644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df475165fb80ee2b3e237d855bea29f2b5a6d94d7eb1c853a51772fce0f22df. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZTAU2225932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88aae77ea1d11a007fe95a5f9b4ddbbe4fd1faf0c52117594b78fb5eb89ddbac. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/QZTAU2267646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa26ffceec5bd6d553fb9ce4d05aaffe626eb51132052e1de7fb20d52d58aabe6. 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/QZCKC1800042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0097f17da8649af357af7a433beba7528c83c209557a2217027325e9922d7e19. 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/USMH92393913.