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 0x78f0ea408be9a598ea7f9c5d4654f6b2035626baacd46bebd62fdb22a7c54288. Chain 2 (Bitcoin): anchored in block 954705 (2026-06-21T13:42:37Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ec37a7da-6b26-4fbf-ae9b-514049026325.json and https://artists.proofprofile.net/proofs/artist/ec37a7da-6b26-4fbf-ae9b-514049026325.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 0x090ed58ea1a49b17e4a49cd36d62c122368a141ebba9d266a866ff7397ee3f68. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UST8K1611688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6e00b556c5b861723d11cba860c640c30f4095e3b478bceffac9fea27f2c6b7. 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/UST8K1611690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb46f3fecd3650c97b8b9109d9d5f6c7a42ddc18fb5a950e155c3e22102f6698. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/UST8K1611692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa432b8e7516e46be4341302d94f72448af60e1149059b109b6f097708d5fa4ab. 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/UST8K1611693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff8a8c9aa0b0e1b78f10b817379a0a6cb019b7cf2b26793df9d3f995d4d2ad15. Chain 2 (Bitcoin): anchored in block 960311 (2026-07-30T20:45:02Z), 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/QZES52104314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30c52f69bc117b872cfc3cb47193496f2ac6ecbeaefd1d41b17c9457a2caca28. 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/QZFZ72000985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd3cf8f3a48c6ead8012524476aaa86f9f5eef4eb3f849c281fc34e8353bf712. 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/GBMA21862125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe5fd4f157869db26d3a1a80e7f24054e130b29143e47c3162fc60ad391a2762. 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/DEUD91668360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7102fcd864bb66fe8db7d7a830a16b72411ec2bafec784bc768dbacb9ec419. 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/DEUD91668361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc99f89e2cc80e2b604cff739291465474cde89203dfa9fed5870f824e63c3dd4. 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/DEUD91668362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e212bab6bd964e2a9e231efb6eb9804978f5d715a82f6315010f5d72fa6b17d. Chain 2 (Bitcoin): anchored in block 960222 (2026-07-30T07:48:45Z), 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/DEUD91668363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x832b0b528709fbae127016f7acef365e52a0b95f69d7d6803f01e6fd7a9d5d17. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/DEUD91668364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0981d692c7f46c7399badf7a13b5b5fe2971af6b510c1d1d4ba25d9c5bcf99c8. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/DEUD91668365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc361546216f766400a1486c197515ce2192c833e5fc96c040468f729a1f114e4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/DEUD91668366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7661b6781c457f701d83dbf379b1e28b076d692b2aaad7b9dddbb6317d54c44. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/DEUD91668368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d51819b9e73501d0866ccf39476974183cb717607c416c4f219af37f150d5ef. 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/DEUD91668369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05ebab0e4bb6fc2586ed31662883df009f38c2193a590f532c3c144082fd49df. 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/DEUD91668370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93c8b3b71a64ff77e8a9e8146bd71a5a158b4ee8003930c592a041f6dd603f08. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/DEUD91668371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7276f30bc2c3c6ae41bc14ff432c17b8569c9059ed8cf72d16a965f3acf41004. 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/DEUD91668372.