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 0xd4da9ec14eca14e04a3b66abeb00920f6a78667de86fb1136016da1fb146a05e. 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/7aad274b-2fe8-4295-b16a-9eee73dc98de.json and https://artists.proofprofile.net/proofs/artist/7aad274b-2fe8-4295-b16a-9eee73dc98de.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 0x84a4ad897a7e578fb41a703368a79931aa2d660a8a4bb1871d3d8f7d4f1371e4. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZTAX2262068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff3ad414c9d47c6aacff254ce6c44d24e3d7be8b8f9ea9bbe50268b0cbaedc4f. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZFZ22352765.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd4c2b639c9658db22588b2250f29a97ccc74eba98e922ad55b427269cd2a1fc. Chain 2 (Bitcoin): anchored in block 958996 (2026-07-21T10:57:35Z), 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/QZFZ62363906.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18f802e1c57e763871e5ea15547083fd5265efa95731dce6de134d948c318ae. Chain 2 (Bitcoin): anchored in block 958728 (2026-07-19T12:24:55Z), 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/NLRD52062926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24cc0662b05c51616a7484d50b40aa03d119c0fbdc1ac523181ac63b21966de0. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZHN32346625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6941e677cca01654a86520a52d11f12edf2398d1e6abff20ae3e6566b83c378. 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/QZHN62334547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d853b1b891753858e8dcdf210ad47d08228b0fd43557d8cf6f7d222e99e2e8d. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NLRD52062932.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdcfb4857da9877daa1316f86168b27ddde83efb310833a9ff674dd6e322dad1. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/QZNWV2305612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29e6f637632511108d6c2bd079facfc9356ddc95f82266d5bc2355bed732c07f. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/QZTAZ2305798.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84b041817985a2b933f3034e2834c264a8eb733c096c6eee3717ea8dfb59333a. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZTB52317658.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd6c5f60bc99cde45925f2e0ba8d46da6d233b1755c7450004110d32b9d274cc. Chain 2 (Bitcoin): anchored in block 958567 (2026-07-18T15:22:40Z), 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/QZTB82342094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f98eda396e0970dacd1232738d22ca7ea43135e69192d7590656624df23c23. Chain 2 (Bitcoin): anchored in block 958573 (2026-07-18T15:49:54Z), 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/NLRD52413721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e564873ec7637010e4809e8a4f7bab477edf20491876e5491471792d1c73b83. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/NLRD52413745.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0294ae13590ad7e8075ceeb45881d748f2af707a5901843df0ccbcb3de78a9e6. Chain 2 (Bitcoin): anchored in block 958142 (2026-07-15T10:09:30Z), 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/NL3M12409441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf522acbc42e9ba9310c1e6fdc0ecc4364ba6afa4439f52934bd7fb2cf3206eb7. 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/NL3M12409449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63d008187260df7ab6ac3cf1d05fce8773d0c13f9b552ed843520e5da3031740. 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/NL3M12409456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a23bebc28ba25fc2b0a93e03a6446aa66287b6cd741467bf3f49772713eca0. Chain 2 (Bitcoin): anchored in block 958808 (2026-07-20T02:49:15Z), 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/NL3M12409481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42a23bebc28ba25fc2b0a93e03a6446aa66287b6cd741467bf3f49772713eca0. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/NL3M12409481.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35b27055ca703086cc05816c0e61487058965097a1b851233659d7bf8181d86a. 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/NL3M12409489.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313da12d1d30c0135a30528ac2b1cc1638f50063513887047bb0e37f70e34c27. Chain 2 (Bitcoin): anchored in block 958800 (2026-07-20T00:52:19Z), 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/NL3M12409497.