The Vltava ( ,"Vltava" (US) and ; ) is the longest river in the Czech Republic, a left tributary of the Elbe River. It runs southeast along the Bohemian Forest and then north across Bohemia, through
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 0x5420a851ac4e07926549dc53a0e64acd351aa03094624ec7d75060e1439aaccf. 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/f1b2ac09-9825-4364-9b33-8f0abc8b2dc2.json and https://artists.proofprofile.net/proofs/artist/f1b2ac09-9825-4364-9b33-8f0abc8b2dc2.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 0x00ce9a8ae62fb58e1a977914e2ab02f5e1bb2067b6b375c98265355308fa30f6. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/CZA239600107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d549b6bc345162832be506634b810c218a658ba20d2f9b923c3e430376e72c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/CZA169800207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa01539ec65687c5af9ce72a9770d0905f8895218c78944f03170f799bdcdecc2. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CZA169800208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3d9086f69f57b9e53208da7331e4d4825f0c3ea17cecd39f0ecac7f7c3a32e. Chain 2 (Bitcoin): anchored in block 958805 (2026-07-20T02:22:58Z), 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/CZA169800209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91d549b6bc345162832be506634b810c218a658ba20d2f9b923c3e430376e72c. 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/CZA169800207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef3d9086f69f57b9e53208da7331e4d4825f0c3ea17cecd39f0ecac7f7c3a32e. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/CZA169800209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e32475bfd2f6114979331de8b3fbe2a39ca2859ff4f47484931d4105436972. 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/CZA239400104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x440976912abd0e1ae87c2eb0a1a917f5eabfe45d12711aaac6597f0114df9eb2. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/CZA239400106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae4346c13150fc4520dec343715b487f8402200099825ef64f0e7ed0e01fcf03. 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/CZD681600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x271ad86a4f023d353c1b75a50fa0c905bc6560e3ff4355d43c2f41ac79ecb511. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CZD681600006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e6a425049a3370f7a15ba1574445721d692289e536ca18d55caba1440286d2. 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/CZD681600009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea7126fe99c9eb3283c53ff2ec3f70e1eb11c9beeb472549a6896a4b6d8d63ba. 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/CZD682200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d7d20487b44a03b08776e45c848edc799f55c64558bae8db492651f69df1f09. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/CZD682200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86409f2361ad78892761c9706460b375bbd0039f98e09d3c916503d47ab55d96. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/CZD682200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dc84461119fc0dac3fd69f8c1724b0ba7a13c3b2adb8c63024c2f07b0aba77b. Chain 2 (Bitcoin): anchored in block 959355 (2026-07-24T03:24:16Z), 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/CZD682200007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc18d7e3164ebae56915e594bdcab1de364ea0c746a2260433d8d85d5eb5b89a2. 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/CZD682200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dfb46c5d18ba47c1f216fb78aed6326540a30e39e577ebf7503cc8e8f0ded44. 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/CZD682200009.