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 0xcc2e319a529e2045d9f0158a4b124627bd49680e83ee98cbec08f64a2c08cfa2. 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/bf94f6de-9a6b-4e0e-9e14-17ffe16027de.json and https://artists.proofprofile.net/proofs/artist/bf94f6de-9a6b-4e0e-9e14-17ffe16027de.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 0x35f11268e0b91b6af80b02a4fd209d87cd82cf80e26680515b39e234b9dcfffe. Chain 2 (Bitcoin): anchored in block 958087 (2026-07-15T02:56:49Z), 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/TCJPO2130563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6fe5cf87612ff4f3e0cf246e42984ef95f902b3621da3ef4eec41f9a3b2c40bf. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/TCJPO2130551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a805ed51f3004686c0b753e391e78d0cf0dab439ad2895174b67d7ed479c368. 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/TCJPO2130451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc123c0b4448ca9b9f1a76eb09c6c64e16a8ee52d23d5056cf7fd1f1ff64b7bbf. 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/TCJPO2130517.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da6ae89d73a18e81caacc737d53179e660fa9f6f8d8dfa8417e369c86bc27a4. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/TCJPO2130499.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f447eaf45cbbfc770b792a6dd36935137b8fffc25e352d1479a6f7859d6ab70. 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/TCJPO2130483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed043a508ad9edda18e18269920fd89fe5b510f65fc3b6ac1e44eec0c70c8d20. 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/TCJPP2138670.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89097cb87ae73fc127e58ebe9ed86d0212a33914ba1d17b4902dc9a4df236700. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/TCJPQ2147879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x33adf2d603fe64e73517ebabd4eef13c50443c967b0909ca15ebc1319ecc0369. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCJPS2214720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5474d6c90becea52ec853e230790fcd610cc17d30a931e4d53544e71f05aab9. Chain 2 (Bitcoin): anchored in block 958363 (2026-07-17T04:34:46Z), 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/TCJPS2222000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x320f5d2c1750ff0bbc1393745c53f49b2a42bdcd0dea1b774126ad02127bc549. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/TCJPS2278165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa41515be7e8000385cd469b118a3ff2c973a6ee6b3c87329955279c73fc51da3. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/TCJPT2291172.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b3198a88d0c73e654cdc726f5cb033ed5f97426f1337c900e23778908ee444d. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/TCJPT2291207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7283b4425722c5b6714efb62fa655a413cf1ba4e73731fd596f1763fda1cc578. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/TCJPT2291320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1342f8e7546e974bc6499aa7f854d176b7ff2eca230e3e918275d8b19ab27a11. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/TCJPB2400958.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb73a1dd31f7492adb3b9e9d0b206c97c871183fc89b103946e47af7268a5e956. Chain 2 (Bitcoin): anchored in block 958793 (2026-07-19T22:59:45Z), 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/TCJPD2593987.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9f96b7c2f0e691dcd666c5d39bd6b8da16a19d0bfe960d7897c9c4766ef09b8. 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/TCJPX2311899.