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 0x58b7c44a9e7357306f21d0246d9861c631e5955fd17894eb10ba428107129e66. 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/2aa099bd-a8b3-4332-a1e5-16bfa2ebfc2f.json and https://artists.proofprofile.net/proofs/artist/2aa099bd-a8b3-4332-a1e5-16bfa2ebfc2f.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 0x396e12c8c7908bb98ccc815f0feb147da323ffe37915ebc286a8eb6c7a136c32. 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/PLF242107701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b490d34a57b0e72741b5a0d7062d4cc7b6b37ab47fdab9d6d2db8d58998e6d1. 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/PLF242007485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4038941e7f0079499e78ea71a12655b51264c116874255fca59febf8246c845c. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/PLF242107604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede324e328289b5df9687c82e311f8f4ab66362b5ad9bdb0f4a7aa13f04d8eab. 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/PLF242107726.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86fb3ec1abf39a44b955be35834fd7553e027382bb2c6c913e45cf6f04b26e48. 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/PLF242107541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabbc409bc20dc3cd9dd681919417730275d421e8490e5192755303ef14371849. 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/PLF242107727.
Na ostatni dzwonek (feat. Dedis, Dawid Obserwator)
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a150b0adba7ed6d880c750f1a66a26196a56eb0b8edef7cd673973fc5d2eca5. 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/PLF242107518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7db94afb85e70e0077f6ca24de3e8f1560d1772902b62918c4c379766c467ce. 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/PLF242107653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fa956a3376d675a9bad8c75f0fc7c6cf042308d5acfaf31fe5311fe0299c769. 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/PLF242107564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6a28a95ad6e9cc066c723ebc27bb5eae53beea2bd9a54147b5c56b53d2e0ace. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/PLF242107728.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c36067ea83a3d0917ff6d16d45aa7fd54f1e2f44b8fad4e5d0211cf32ac3448. 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/PLF242107729.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a8567910a76f6fdfc19b734f7b048b3301a2759e854042b095da8eeff0fe385. 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/PLF242107730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf774448e45d8ce2961ff82151ee84a25d2cfb5983f9951f08eac35ec5042ad56. 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/PLF242107731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8a3c61a57ce9865b54db0f3b395ae021c5b6c6a6d09ba33062f3f9be765b39f. 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/PLF242107725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84e1d6bd68f29b3591290c57c07530e999560301e8200571b836ee54e6cbd1d3. 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/PLF242107732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa37fcd5e0dbaa0f4ada512086cfc69acd1813e481ce9135e6a5ff5d440a8589a. 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/PLF242413347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa331d02cf9c28040444be1a526980e67990113c2ad990f937400d52fee324bbc. 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/PLF242007110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb08a547e7b42471e50992d0eacc80b37c3695129c474cb52193ea6f7bc25452d. 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/PLF242108500.