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 0xbc0e82dba39cf6edc013e0367f179259f99d0855b14ea4c733fdb748c7cdf205. Chain 2 (Bitcoin): anchored in block 953674 (2026-06-14T19:07:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5f7526d8-6b53-4fe8-a03f-db8cc9d1f364.json and https://artists.proofprofile.net/proofs/artist/5f7526d8-6b53-4fe8-a03f-db8cc9d1f364.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 0xf5684a243442504dd09d97d39941762adfbd1e5436a6cd2ffa2bcb280152453d. 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/CACWV2362895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf98aa82142e4adb89f87e253b134c571b1682fa134d31dc5a53c30d0fea837. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/CAENV2316392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefd6f2da2af502e8b46c4d8908eda5a065eeb325c6f09fe40bb95eef12b76ff6. Chain 2 (Bitcoin): anchored in block 958825 (2026-07-20T04:55:29Z), 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/CAENV2346518.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb46c83fbf5bff7d42d76eb0db665b090e16d06df4dff4da17519a686411ec2e. 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/CAENV2355906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e5c2e362123a62b0c265f5eb76439318962980f93eacf6a5034822411110790. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/CAGOO2316817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97ea02c90848b87d4e6772454fb9e68b38de3cc7df9786a4d18d889e642523f0. 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/CAGOO2350137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27378b85cba9688f996ca9c88fa11083788411cd567edac1cf6ffa2e3781d703. 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/CAGOO2350200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfade0db60cb84beec0609da641429aa2ac6a41ee7f1446e42bfa27c7b812fad2. Chain 2 (Bitcoin): anchored in block 958176 (2026-07-15T17:14:36Z), 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/CAHQJ2451721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b6cf51b0789cdccc3b4c8998fa2d56843487c429968ec8dcd77b777dc93103. 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/CACWV2418986.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb3670d63bdebc23845ee1338a5c3cd953126aa35f5ce3d7db847924b7ad042. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/CACWV2417829.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0875be407b11e6f9ec0030c6ba0c2a55438ce1484c341c6287bfa0190bea686b. Chain 2 (Bitcoin): anchored in block 958390 (2026-07-17T09:35:49Z), 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/CACWV2418988.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde93d2b9844c8013ed2e8a7c89b764fd0e48dd1d8b54c969e43c2b2387265a8b. 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/CACWV2439885.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61d57a22150ec0e9ce06117549c7d27f3981de890f2b30f35655b7c26903e4a6. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/CAENV2445054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x346b5d980011719a2a314048135f19da273505ab579ff5a69b610dee2e6b600d. 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/CAENV2492727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e9564285bea514339418db93962e2607474c29dc250ea0093cc295891a031eb. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/CBEYJ2402048.