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 0xd325670d9729714f2f4344fd9a783ab035e3973782098c5d18fbfb44f5343b89. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce26dd94-e099-4ad9-9eb5-8eed3b477963.json and https://artists.proofprofile.net/proofs/artist/ce26dd94-e099-4ad9-9eb5-8eed3b477963.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 0x86a05c3016233a7e731a158a135b93e6e7b6cca6e494e5a9c193e708c1958ede. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/CA5KR2491850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6b17b244f93eaa1346fd45134b6b8f5a1d1c3e6fd94e9971c49ca8ef38e0710. 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/CA5KR2491851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80fe0f8548eccc51fef65db5f13e2a256ad8c12e3df6e9db70a324eb4198a867. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/CA5KR2491854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe1bbe27e5f56bfdeb3e4e7897ae52381266512912b9e19aece1cd100049080c7. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/CA5KR2491856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cf8b5f13d28f9baac10891c190fa279b8e9a92a95f5d106cbcf8d6fc8243219. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLCK42401586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2ed8cc02b1ff1e01102d294b9f62736acbede180a038937a893be9631f8212. 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/NLCK42401587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a0534ac5b340503c5e38b14eb433b0761a8b7e84f4c522c73ee66280018480e. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/NLCK42401588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5322f5f514b4a11b17cdd37d0414cf216da6e3c5c1ff7eecfdb0990e277e9a3b. Chain 2 (Bitcoin): anchored in block 960108 (2026-07-29T13:09:35Z), 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/NLCK42401589.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ca42695b500d3112bd21ee683739cc1393a09e2fb02114fffbb23b596cf386. 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/NLCK42401590.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02a0c6ee6fbf2177b240f28c346148e42f1577c47eac04cef24a587a2df06d18. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42401591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a193e7f8b11000f8ad40c52e1b0d5e36e5a96bec2cc38ca18113b1b10ec1335. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/NLCK42401592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3236b82ccbc0b1e2672e3b09d88a829779b7002fbc7d8a3c4cddae1c3581d277. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/NLCK42401593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9c8b4897eaa584d08618990124cb36c9351f5ef30453ee92a8e14d1cc89af9. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/NLCK42401594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefe01f680e2dae662fce93b36c665af1250f11556409f6ecd2f1e45a146b4422. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/NLCK42401595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78445f05799e1fb269820a7acc41c31751a794a18f6963782c6771e076203c33. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/CAGOO2466055.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0097c82efad5fe875064ef9e115bd89406e9cc85f20ee6065d03b5cda87c6c25. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6Q2462018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2c904bc8c03ae9877ac51e1ca789bd739ee46bc7407c59bf271ee10cab04b2a. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZES52485173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x296c6f1736ff428d08ef3a94e10ce25572d8421ceb389ee023fb6be9208c433b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZFZ32422862.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2b08d213ff22a4ef405784ae084124b9ecaa7b89ffd7acca8625d1bb7f81e1. 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/QZK6Q2246466.