Cheb (; ) is a town in the Karlovy Vary Region of the Czech Republic. It has about 33,000 inhabitants. It lies on the Ohře River. Before the expulsion of Germans in 1945, the town was the centre of t
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 0xf05082b8ce102b0038fb9497bbbd8682631b6fdb2130bb10fa6f613776c2f8e5. 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/2a397022-a220-4e1b-b70a-a7074af5878a.json and https://artists.proofprofile.net/proofs/artist/2a397022-a220-4e1b-b70a-a7074af5878a.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 0x17515fb7cbe110d05841fbe0f160777bc831eeb83b20b5211c1ef44602736b95. 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/QZK6P1949725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa881ec60e96491f600c0edf1ee6e09a56c030c6935b7bdac6c6f92c648c8bf6a. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZK6P1949726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x333c4caa8dd6e2b2dcf27dcdeafcf3fe92d221a5c68aaf7c031c837aa09481ad. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/QZK6P1949730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x596fc0edf4194c97de137b09b3f6db897aeae7186d08a738b599583f1ff76abf. 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/QZK6P1949732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d88431ab9370e81f18f8597210a9e0f7bb7df3484215aefa69870c61d9a12f4. Chain 2 (Bitcoin): anchored in block 958547 (2026-07-18T12:44:05Z), 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/QZK6P1949733.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe15358804e99a592b45511247dd01f7b7abfb14c4f4960667d8cc0c24d125d63. 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/QZK6P1944864.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x435f630b180bbd1679d5529ddba73c89d4a46bacf7e4cf852254244372d1400b. 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/QZK6P1944867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3161d4c0fc675c3c2f71ef24fee9c6b96f90635ed2b99946fadaf2c73551551c. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZK6P1944868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63cef57899e1a550805587eab43a64d92b392c61277108e40e3effe54f6b3da2. Chain 2 (Bitcoin): anchored in block 958945 (2026-07-21T00:35:28Z), 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/QZK6P1944869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ed26e00dd9c9d9ba736fe784713834dc10f8fc7336d9dbdab6161db3f9d8d3f. Chain 2 (Bitcoin): anchored in block 958401 (2026-07-17T11:10:25Z), 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/QZK6P1944870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7383f52d166ac9085876f0635973037a5c518ee250183906cb0ecae9edd183e9. Chain 2 (Bitcoin): anchored in block 957680 (2026-07-12T09:07:22Z), 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/QZFYZ2091914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e028878cf215d13b911e3617a05b48a85780c7805e0b9da3c2d1affaa32f7f5. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/QZFZ72015808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x450ee774623468d2a14e58c23e4904d3d7f38cc824107ad96531803b18a15265. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/QZK6L2078368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6974fb564d44bd007623cb2cde2bf1aeca6430351a3044a3bcf8916dfacee5ce. 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/QZHNB2004302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ecf0c41210762a3c6565c54ff91bc6c57e0deec73e1f494169b23223d099812. Chain 2 (Bitcoin): anchored in block 958069 (2026-07-14T21:37:55Z), 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/QZHN42033151.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c859da9a14067c4ac501282b06714a714f107e9d66de886898ab0399b017a3. 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/QZDA82130029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfa92f593be58ade099af75fb653f16badc968bc515e3fd742cff99420d242e4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZES92180820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1882951af58c932b86593e673af2aa3d9bc2814b5ab9049fbf09b1b59fee449. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/US83Z2142787.