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 0xb7ab2c71a798826a08a9454ffb85ee833a84e6443e0a3e705b76602904d9d488. Chain 2 (Bitcoin): anchored in block 953727 (2026-06-15T02:33:01Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/90183ef4-f1f3-40c4-9b50-f996b93802de.json and https://artists.proofprofile.net/proofs/artist/90183ef4-f1f3-40c4-9b50-f996b93802de.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 0x98a9a22be99550faaeb0bb7b0b833990d9dff4e558c95ccb3f61fc12c5ccd9cc. 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/PLB171301588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47b26745fc1c60fbcc354bbfcfbbba2f89e97de40bfce37770f919fc6619eb6b. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/PLB178900042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24645f2e1b223ec055f4c7ac5f497075078563023109810d9d74bff17a693101. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/PLB178900043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d83a9b4a018608847d30a9ae06460f8bf6997905bf043d61fea30af1df8dd98. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/PLB178900044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9a00c3e71a2f6e787e3d354d7dd51ab501ae3b4aa6c2f2ef515aecd7b34185c. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/PLB179300152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e59bb77086807452525576af1c66d167cfee404fe9abe252247c7ceda2b137. Chain 2 (Bitcoin): anchored in block 956776 (2026-07-05T10:59:37Z), 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/PLB179300158.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd13f48914e925db8d4d2546b20c131188da1907352ff1b0a10e73aa9673571fb. 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/PLB179300153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64b4af5d2af82b466e0a5f488520be35d1ae11a59d92ee3c3f6433222313d4e3. Chain 2 (Bitcoin): anchored in block 958860 (2026-07-20T09:58:28Z), 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/PLB171301594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe10d9aef3d5adfc956d249008ea2229ab03c007ac1954c94b79d7a171ff0c4e. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/PLB179300154.
Po Prostu Pastelowe feat. Czesław Śpiewa
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfae9187921b2792a539c4aebc94d6d647b20037f91391460a0181aeb14d7a20d. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLF101400203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcd11a012302ce7b0395d46d358933aa40b83000cb079eb5caa452962f331e2b. 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/PLF101400204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x263f68222662821e225ead61f7e4a23c9eacab918a57e3d42caf8a85ff8ed2a7. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/PLF101400205.
Echa (Nie Boję Się Deszczu) feat. Michał Wiraszko
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55dc71d40956dcffe64e7838a567e87bfcf231673f4d708f060dd47db720c6fb. 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/PLF101400206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f7f20f3fe0445287aa84b2f89d44300e16ce87886a634270c0b2cdfc6b9480. 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/PLF101400207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18d6aa7135e4e21fde6eacbfd79b5ee1ddd24211208fcae08b8ea08a32a547f5. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/PLF101400208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x702378d6de19f4f2e54f0c19160863bceceaa3604f8dcf49aba38a3e0b8d8368. 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/PLF101400209.
Po Prostu Pastelowe feat. Czesław Śpiewa (Holism Remix)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8203b477819bae7e417a49cd92ab0be82cdc2204b5fa08ed9caed61abfa2c4. 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/PLF101400211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x223c8013f9f13dfb56f42966eadd7c27cdc38cdbdcf22794ee1ae0d58bb8614c. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/PL3E02400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf40ffffd0eb139d8d974af15b840a3486360cf46c5f71805243e6a957e474f7. Chain 2 (Bitcoin): anchored in block 958523 (2026-07-18T08:54:12Z), 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/PL3E02400016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0134a113d6c02e4ffeddc0a17523fcea5e5f5f4da524ffc6ad60871d4d712c89. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/PL3E02400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f1ed885b7ac07e15dc3a498a86e59941866c0ec698781afeacfb3edd5a5363a. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/PL3E02400019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78c232c8c5ccf61ff573b50357ba24243126ad3c7714d5c93b689bd2f8c1d6b7. 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/PL3E02400020.