Bronka is a village in the administrative district of Gmina Brańsk, within Bielsk County, Podlaskie Voivodeship, in north-eastern Poland. According to the 1921 census, the village was inhabited by 2
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 0xff13364aad619d3f20dc6df1afcf58a5538fbca8d5b6853662f5b14719ac33a8. 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/c15e726e-9562-493d-9d37-471a48ddac4a.json and https://artists.proofprofile.net/proofs/artist/c15e726e-9562-493d-9d37-471a48ddac4a.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 0x64ffae433069d2d29c08d5df2bc6935ea5c7f8fc1380e43d9a70bc5f04208bdc. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/QZRP52353220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58022452fabc35dd41662b9e6340d7e7848ed5ee2eb1ea38206fc64e0b86f771. 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/QZTBC2324816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11132091293ee9680cda6839b7c4fd94febf0b1d7fb696862f49e9ef90ddab4c. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTBC2324817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc53a3e32fc9e8017783e34c7965f612f3e01bbdd05304b54be86e15ddf2190d0. 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/QZTBC2324818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b38356d81ee709a9ed2c2d6dc1fe96d6b7706e5604bd0f1127f0259543e96b8. 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/QZTBC2324819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee2ddfa23766d0bd0dbfc10597fe559612960d58046e14b4b586b021de3c0a6f. 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/QZWFV2406704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d68790f3644335be0fb23cfd05ca17c8c3995a005992b52b005b4e1e4391eb2. 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/QZWFV2406705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b639c98f3b3f70162dad14b790d1f99cb9c9a80677ca6890b9acf2ef1ac6771. 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/QZWFV2406706.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c774b5767f824b6ed4ed44fe8c6ca2ffd3738f338168886f617eb4fcb8d6ee9. 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/QZWFV2406707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef7faef538e01172c7b5aaa8e493b53cb463f92aef91094d28b1f13850d9cc08. 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/QZWFV2406708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa2ed3f86c4105792185739a23623952217ed2dd4764c38632da827ceb44896d. 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/QZWFV2406709.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da3c450e95238570ab789000fa2e1479251035704dd35ba49dfa43e0924eaa3. 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/QZWFV2406710.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b99744574b58b53517ddc3e77e24c8c02d58784d765296c7b988b056c3616b8. 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/QZWFV2406711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x366ae117a8aa88d982b1409e10e710c093ec86be4c044f3963348bb0ff7a29a9. Chain 2 (Bitcoin): anchored in block 958110 (2026-07-15T06:57:12Z), 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/QZNWR2573727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfce25ea960ebaa734296a263f9c2f16eece9dd59c75fa10dd0d2116dc113f3fb. 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/QZNWR2573729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dce222fe2e259029b5173dad8864ab38cce795c8f56709c8084edac3a1cc5aa. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNWR2573730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f5daa6951055ea1ede56bf6254654c7777a6d8f35101bab2f6d721eab5865d. 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/QMDA72339322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93f5daa6951055ea1ede56bf6254654c7777a6d8f35101bab2f6d721eab5865d. 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/QMDA72339322.