Lubin (; ) is a city in Lower Silesian Voivodeship in south-western Poland. It is the administrative seat of Lubin County, and also of the rural district called Gmina Lubin, although it is not part of
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 0x4c7650362f9046fb995acfb96fc79784a34840fbcc796a2522a885d9098d85c9. 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/22aa779c-c7fe-427c-84e3-922793d92857.json and https://artists.proofprofile.net/proofs/artist/22aa779c-c7fe-427c-84e3-922793d92857.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 0x308992f0021405f1fd045e354709b5961b70f22f606c56e58e4d996e580305ab. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T16:17:58Z), 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/QZDA61876090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0f07d9e1d7f95f16dae726aff39adfd4332ae8d7b5c40edcda45e8814432b7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZFZ62092606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a105d2771d4f9f3ddcbf4b8dd27b79897f88ad87caa191f2157a646bfd22fe. Chain 2 (Bitcoin): anchored in block 958666 (2026-07-19T05:00:30Z), 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/PLS282000095.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ce58306edd228f1b6e2c51e500753852bb330c4b3033ea9710190b9cc70ff66. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZHNB2058193.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96fdd50c25f739f31238a514dc90853dd3d20f4c3e80967aa26722d3192f4c49. 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/QZFYX2191304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf865b3fd4e4bb55a1cc9fb2135a0f32a7708a0c8fc5d2aa7c6d22b01d4f79d66. Chain 2 (Bitcoin): anchored in block 957882 (2026-07-13T16:48:10Z), 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/PLT612160001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41412f2551fc433dfb10577d2c1f718160266a35d24bf784586d6286d493a332. 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/PLT612160002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e555ced7a8e2c438bf66e14cfa3a97cf3f1a2f00bf8aa08e749d77feab2d18d. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/PLT612160003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997bd0ff18226e971b7d3d5dcb22a68d0d2ff97a9f5c2c3695a9f8cac19eb941. 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/PLT612260001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670541a250c85096dd0d67c13924394d1c2b02f91b4f2d4c269bc9f5aade7c36. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLT612260002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f53b472b07526f3a9b017095b93a47f7c0d0ea04bec0a8f8bfb7bd892e9d93. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/PLT612260003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e581ac7e3dad6764136d24b6fb04916a425164da62921bd7d67c2bf27ace04. 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/PLT612260004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41412f2551fc433dfb10577d2c1f718160266a35d24bf784586d6286d493a332. 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/PLT612160002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0f53b472b07526f3a9b017095b93a47f7c0d0ea04bec0a8f8bfb7bd892e9d93. 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/PLT612260003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf865b3fd4e4bb55a1cc9fb2135a0f32a7708a0c8fc5d2aa7c6d22b01d4f79d66. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/PLT612160001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x670541a250c85096dd0d67c13924394d1c2b02f91b4f2d4c269bc9f5aade7c36. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/PLT612260002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429b09a3ffe04cf516b238afa3a874010c290a0e29bc993f148d962582c357c0. 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/PLT612260005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf28285375b3aa9439f2baa9229ddb66917a6cfbe7df5203df5c276f365b83b04. 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/PLT612260006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x997bd0ff18226e971b7d3d5dcb22a68d0d2ff97a9f5c2c3695a9f8cac19eb941. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLT612260001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d20b638d9fdf98d2b9f40ba49524d10a56ed777a104dc64541ca9e3b08099ec. 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/PLT612260007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbee7b1a999a7ef46c916973159ea5c5a1fab1b507fdef102933f69fc400bd4d. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/PLT612260008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaee26a86a7596fa7ea500267530fdff64e9fb3869da3f572aa530bff4d9c1fa8. 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/PLT612260009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x854d1fa86fd98c23d6bc4249260edf7f5d60d067b1876e72ae4e9a1c2e2db28a. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/PLT612260010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3413d691e83e187b22cfb1a08bffcec87e4d94dfbefb19546b259b003b0815d3. 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/PLT612260011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e555ced7a8e2c438bf66e14cfa3a97cf3f1a2f00bf8aa08e749d77feab2d18d. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/PLT612160003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e3336b09e57c42a3a9e612bd4a216bedbb1656ff564fbadc780dba2cd45dd9e. 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/PLT612261001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d3ac96105624a3fe270b120391856f5b701c90b3acd4a13b27f70cc525d805. 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/PLT612261002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcba504cd3b49913b44852b7e4617353b7098df1ee85b1efa6058431953b1aa5c. 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/PLT612261003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f08e7ecbce350e828b51ec647cc4b222f9ff3e6e6708ac235ae10b24eca3a3. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/PLT612360003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c3cebbba2262fd556a2e38107255033579b164f3624397c3e8fc8c6b927e4c. 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/PLT612460001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b0cecee17cd0c899ce0216c6e7555c16db841452e4e59025aaccaa921f16dac. 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/PLT612460006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41623de37a0366c7d5b9b357053589fce28dc360b613fb0b6d06a03399c2ef88. 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/PLT612460007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7ef41fecd742450247d923c4a35c1291bdbd73a80dc8d637247d08c724fb24d. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T17:59:52Z), 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/PLT612460008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3e00c68731d0d80386479c7c424aeabdb22262a4344932154f13b0265944b92. 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/PL59G2100216.