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 0xa3d7535c31cc83a2757d575c7ab45851cfbe17ec1079232b3f6d59ce317118d7. 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/edb4d12f-f1d4-40df-9bfa-4f2c791cac6e.json and https://artists.proofprofile.net/proofs/artist/edb4d12f-f1d4-40df-9bfa-4f2c791cac6e.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 0xf492af324f092eb736e6b817786cef2b0ec168bfad2e91b5d487fc27d63ae03a. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/NL3JA2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7607befa19353b78a7d0a879bc9c4a6f087292d2115f6cb412a424a244b48274. Chain 2 (Bitcoin): anchored in block 958268 (2026-07-16T08:56:51Z), 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/NL3JA2200023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x520690725d6b8748ffe3a9b665baa162194a643a20e907a80db84f6904e899e9. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/NL3JA2200024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d37a3cca24a0ff787dadf32e2d8c4c21ddf884649741019b20cc04edb91722f. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/NL3JA2200025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa5a3eabc1c6157886b8a2c13804a1491377bb3f600ac48200cf8cb31c52f23. 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/NL4WT2200189.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x621236ea2d19e3689c07990d0758f435e520902c76432a800a5c32e940391099. 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/DEQ022291417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5d29da9982b502321cc0c805c0456473511fe940dc83c1af8e7c04d908f8fbf. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/NL4WT2300014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x931ab6b7a6b5a34d19c291c43a821baccc032f4319ed998578578116de39bd1a. 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/DEQ022383492.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd4da362956b711a68ac6a8c60f353130aba8f5bd0f6a6731922ba2b933bc56. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/DGA092377196.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x584fd67fadc768a3ee9451d61f321454ff2c0c97f7e15fb11ae09664ce086481. 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/DEH742402121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea53cb2d73bc9c03add468ca89ec32fc538d3d03fe650d9a4a88b242a996a2d. 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/DGA052496625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cadc8d41bf984ec3988ffa46fc27b500b0e9d16450df8a81d77c8e2c3c465b8. 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/USANG2415050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56612e4ed6f4a07c9ba59e504a1df490fe246cda3001079f70a2a84c86e46a8a. 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/FR59R2505165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05e738bd9fad44dfe18b378620eef40a37505a78770ac9a2f6350ce9ecc18c4a. Chain 2 (Bitcoin): anchored in block 958857 (2026-07-20T09:45:25Z), 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/US3DF2532968.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78e7f00b7951dc02758508d28000c86ca6d2d32c520b1cc1f987e669524cebf6. 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/CH7812534889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcebee625b2af6a5af9cbc2608881f05b0a5b02484845ccfe83218943ccf84e4. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/CH7812537439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e1bce5d828777936ec5a569ff0efc829c249e79b411a14ae4353a3e2664e00. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/US3DF2598569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68ad67c59040d58ee86b9f895d8ba1e6679e3e024043aaf7f242eb97e85b6198. 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/FRX872579773.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400e4fc20f117d8a2472b38fe3e7d502ac0c87ff4d2d783ba89933e11cffbea5. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/FR96X2556606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x648618aa47c3f90d03c02b16e2ac03737d4de7697ae47093fa6c4fe8f7933419. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZDA72245947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4921180c06f781e9cee92355bb1fce45621c11f729260e1b7d0f1e3872dd8a8. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QM3DF2243817.