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 0xb3b67caf564f7a2f885711bf24bd0b00806bef9ef58f8b5422cf2d31b4ec4d46. 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/a69fb74d-42a2-4d8c-8ef7-fb25c9f8faa3.json and https://artists.proofprofile.net/proofs/artist/a69fb74d-42a2-4d8c-8ef7-fb25c9f8faa3.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 0xb85cb70a0749405e1bd8d8b1930ccb679c604437d3d837ebd19eafc5c878ad59. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/QZHNC1952298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfac15723049043fa7880441272c074967356d6f7b1625dcc38aac30c0287cb04. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/QZHNC1986735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf79c9edd39c55cdb9fba0338d44e8d0fe2341442e8bfa59560b298ae28b53ea7. Chain 2 (Bitcoin): anchored in block 958211 (2026-07-15T23:24:33Z), 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/TCAER2009448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24880ca196ae273ac51c79472e68f8cdf3fbc962fecb0f5ed7a754b40c372649. Chain 2 (Bitcoin): anchored in block 956742 (2026-07-05T05:07:15Z), 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/NLX9G2000029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8745999fbc303600282085b9dc519b55574e5aa8389679adef665ee324c70a. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-17T02:02:37Z), 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/FR9Z62000468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69f81ee37e815fc829880a094c123ba1bc8e6c2cbc6967b952acae027bc012ea. Chain 2 (Bitcoin): anchored in block 958722 (2026-07-19T11:03:50Z), 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/US3DF2176321.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74d4a03f03a89f42e4c02902977bd2f641b90f9c28d644e5bbe3c036392db043. 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/ZZOPM2115624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fb7857bd8a5d5601dc1d291d8cbd17156f51272a255fea293034cba4f23adac. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/QZFZ22244028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x342059bf222dd3480824999c0033f03db413c7ef7cc072c8a1d43795a460ea79. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T21:58:49Z), 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/US3DF2290218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb6c84828f0e9dd5908afee06f0860a162ec80a90ca155a4b7017ad21536c7b. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/FXQ892200309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5cd819f62bdaaced5a6c135b75e19daa54da6fd180ff67bf875ccd9fca86f1a. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:28:56Z), 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/USANG2256590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x699371bd04086e4fd77bad94add12432497c8b5a6ee67581a2cddacb881bfd64. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/NLT2H2300111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x546a16d86964efc76f8c1e3d56ff455a734c3d29d7773a608afa263a1d9ff218. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/GX8LD2386837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73733b2de52e3df697ad38077ceb542ede5598009e192a869a72c97fa7404681. 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/GX8LE2321401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e434308c657f77d08cb0e60fc75cbba548f99707232675f1ed2d7f1553835f. Chain 2 (Bitcoin): anchored in block 958822 (2026-07-20T04:30:07Z), 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/GX8LE2368052.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0899b4860c5f13e364a40d93d4de730c8351659b59209579bd1a8f2a39eb2293. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMANG2222016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5304f2759af50b990b132d5d87db67f7eb9038f521f22db3a3ee688edc28f4. Chain 2 (Bitcoin): anchored in block 958224 (2026-07-16T02:28:43Z), 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/NLT2H2400691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b6ca81e8768fdd38c686324d0e0780d334f08741c02d8fabe28373f9bbf3814. 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/USANG2426329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58d99692d8a803b7838f1b79e6cf5af303fbb5d1d0e4a90c38be472e5b6c886c. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QM3DF2416206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8482383182bd77c2c52c15b5c6bfeb139487b4490f88dbb73fa5be846c2e25d. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/US3DF2529434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5fe0b8d5f1ca4116c9691904e2db6585159a7acd074ba31f018009ae6232e1d5. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US3DF2555170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95c1e92007b276d7519ebea11519d1ed88e4a0f5c00ebd3aed1a9aa2d537d843. 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/NLT2H2300458.