thumbnail|Lineup 1985/1986 - the "Nowa Aleksandria" - era. Siekiera (Polish for "Axe") was a Polish post-punk band. With fast, aggressive music and lyrics filled with obscenities, the band was a sensa
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 0xc52ad8c11572b215cdfccc2fc02bc588b18f8718a7b72685795c75e004a1b0ed. 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/11fd4c11-426e-423f-9899-104caf367c79.json and https://artists.proofprofile.net/proofs/artist/11fd4c11-426e-423f-9899-104caf367c79.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 0xa0958db90f017d4e8bbd5657ad7af121a777c066575bffb76eee863898119d15. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/PLB171200667.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a2079d8bfa9f2d11bf3c23e2267e9eb7333cc399c534ff2e8e9c8d3caf0d76. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/PLB171100338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x043c2131277f66d8ed940b8c51e4fc0be9916baae41976627e20f91c63c60016. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/PLI362801030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x261cbe006c3bba5d31e1d952309ff646c9935bb5f2c10ed959ac54794a50e0f9. 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/PLI362801050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda4ecad915b072e502dd61637a48bbb5628d79d71510f7d1b4f287e3d1eb8c74. 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/PLI362801090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c4fc7118f5b4e7e1bc005e34b8c2fee267e4bf0160728873c90b2cb1b21267a. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/PLI362801100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b73f5b550ee7973e85db1abe7e97559a184fc2088a151db74ec4eb6a83e57be. Chain 2 (Bitcoin): anchored in block 957709 (2026-07-12T13:52:43Z), 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/PLB171200669.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a5e1c33561320c64fad28d8035528877c07a66f0a21c78ff0d06dc81d95eaa1. 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/PLB171200670.
Misiowie puszyści (Szewc zabija szewca) - Jarocin '85
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35e42fc1aa5197a0e90cf5fcbb6ad5d36088187ba7927478fed0b2bfb03a43c8. Chain 2 (Bitcoin): anchored in block 958601 (2026-07-18T19:27:02Z), 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/PLB171200671.
Jest bezpiecznie - Warszawa, Róbrege '85
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f01cad1f7e3f0db32f0fe9b15b08cb610b582f2eabb29d724e3b0d6d57f742. 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/PLB171200672.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75a85a93f2419f2d69c7598244dfd796a3fd51609755dcc6056903eb73d536c3. 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/PLB171200674.
Misiowie puszyści (Szewc zabija szewca) - Warszawa, Róbrege '85
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6413ce3ca9c0b00367ff85eb23e7de51b2130c8a73c33966bce4e952327fa58e. 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/PLB171200675.
Misiowie puszyści (Szewc zabija szewca) - Puławy, Dom Chemika '85 demo
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee0d15a7f731c97f4d5d0ee35ce14edea45f234ec5c79a2e165cc8ac03577ce0. 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/PLB171200680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07a2079d8bfa9f2d11bf3c23e2267e9eb7333cc399c534ff2e8e9c8d3caf0d76. Chain 2 (Bitcoin): anchored in block 960101 (2026-07-29T11:46:30Z), 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/PLB171100338.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8e01e29596bf0cee0bca7b4183eba6783c3890697d11f0a6d7912c5f4ef5832. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/PLB171200657.