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 0x8afb331a1d9118701259423ff7682c13f63ccd5b1be7404858137ff6a16b6670. 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/b8b0802f-1af2-4611-b65e-eb0ea1eba467.json and https://artists.proofprofile.net/proofs/artist/b8b0802f-1af2-4611-b65e-eb0ea1eba467.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 0x3b735dc2a48a968657407e87ea0294ed83a3d889ecfd1412b7be46f2cbe8cae2. 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/PLF241602575.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x195d7bd7cf0bfce25657c5cde11e345d8072ad7ef1524a711f246d49c5eb2441. 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/PLF241602576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50729cb8c4c0113aee8a10c1af979379d19bc19b77161a8ea2c85b44d1eeffc9. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T13:11:09Z), 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/PLF241602407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17663194dee502beb64ddd91541dd5f3648992fff90254cf0f67dbd70d689842. Chain 2 (Bitcoin): anchored in block 958134 (2026-07-15T09:14:08Z), 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/PLF241602579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1afb992d76e01218c7e03d97a332f26381c13dca68d996f5e894764e5c3422aa. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/PLF241703973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x874e93be6beaa10e1623d64cf4f949ee2b1ef562eee2be2d1ada75107402b355. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/PLF241705382.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2977b13c39085d5bbad00fbe1753ed4dea64f2c19a5b3a0412dd8f74eeaf8cb3. 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/PLA552300186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x46fac9bb05bcd74defd567778efc523274a5f1410749d3098edf2dc5962760b3. Chain 2 (Bitcoin): anchored in block 958625 (2026-07-18T23:11:57Z), 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/PLA552400730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e6b67f3ad57620ed804776484fec52d3fbbfbfc677c7e8923d3163355a24930. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/PLA552400904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1c6696d0c4f57d7324ae88cf617aa1b3002821f7383fb67189fa6c44024c32a8. 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/PLI368386220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5ccacb14cde3c9490213c6f1146f0009a4a566220df0409dfcbf0c876c07ba. 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/PLF241602343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x403bd18e228b63b5b47ca89a868eb5aec72a7702f7e1b522a8a2404d0e538454. 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/PLH181800607.
Niepisany Kodeks feat. Mesajah, Tallib & Sztoss
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf13b58ab7f932703aff40a7df32f1aa4fd6778e641c0e9850fe62a293dbf57fc. 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/PLK561400018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee7f6ff5b677df24e2913013b001ba606c18e14a87feb573401e4a694e8886cf. 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/PLC061806752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f93be883b3f6e691a79de9eb7d8a6c44438f08fcf9eab2769e2aabbeed2ab6e. 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/PLF242210108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd804937e3c60a64bbd27ef7263f04af2d335339aa8bddb6334058307a7d02017. 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/PLF241603807.