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 0x22f559e28aa768064352b05aceb43d1c239ccf76a33760df59c42bfdae2cfb6b. Chain 2 (Bitcoin): anchored in block 954580 (2026-06-20T17:48:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b6eeeae0-8c32-489a-8a3c-94e1a3c16446.json and https://artists.proofprofile.net/proofs/artist/b6eeeae0-8c32-489a-8a3c-94e1a3c16446.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 0x50efa947e2dc5e3b47493ef633b4ff5a3c9d8b59b79ea3c57ad0cf97fc86ddba. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/PLF241704581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b13636026e094122893effb440cd488121ef8859b8c0f0e249e53f6a1b0c1bb. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/PLF241704582.
Kalejdoskop zdarzeń (feat. Nizioł, Marlena Patynko, DJ Gondek)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11b31c8ca971a0cab6b0065bd0e44a7da75db0f28c3575ba22cc3fd3c1872a30. 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/PLF241704583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1a4562db77731fb4e639a0f2f66f8f415c05d2effcb884a898a2e31f12089b1. 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/PLF241704584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8b2b86d753e64bbc6f6947f7ccbac80ff424190c8d4588397bdd2d0fb66d70. 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/PLF241704586.
Wjechali na imprezę (feat. Guillotine Mack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44193642ab3fb0c74e6d5171d0a14f850ef4824b90a06566c44c7d5e8942a4c3. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLF241704587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467b88ed0fa2a26d2d8fb9d4d0b98e29bf50abe4d9c474b24dc1a3f4bc772364. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/PLF241704588.
Nie ma co się bać (feat. Daria Kwiatkowska)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc1fe7a774d4f4cea7ddaa5e3ed9fb294be1e2f2bfc768848a33bdb7abd28ae. 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/PLF241704589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbba4c5ede711427edd5e257da1da7710785805f89a1bd3aeffe6be30cc4c76cf. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/PLF241704590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa45c953fbcedc492081e4cf696e8dac4b84bef7d5be62d771ca82a599a11e129. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/PLF241704591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aec1c0add752d14cf7923c89cac650ce406babf3b6f23cc7ae8dd5417162e89. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLF241704592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78ccfa4f0aba01f373086d5636c9052325912658c893d054d8a05a5469a53aa8. 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/PLF241704593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1a84cb6f61ea4008e84aea9b2be04f8fa1116c412412f8f637f7146ed42253. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/PLF241704595.
Życie z odzysku (feat. Vader, Guillotine Mack)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19afd2dc5fe4ebbf4332fe49ff9e0f9e61e1d8f24796792cf5509c35688b03a4. 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/PLF241704596.
Opowieści z osiedla (feat. WHSP, DJ Gondek)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02182657c760e2ed1f0a1f9f66f977a21d64d8b67da9234c5e94114aaca25560. Chain 2 (Bitcoin): anchored in block 957064 (2026-07-07T16:43:08Z), 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/PLF241704597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1b7a8ba759c7465e25c1428027b4158d06fb025b2ac2201b809194d75162893. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/PLF241704598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4395cdbf4958e006264ef2835fd33360dc563ed8552a32de14d485ebe1526484. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/PLF241704599.