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 0x101ff373b9e67dd87e5755c5d9f25d046e2dd8bd695d0b3567900a228277505c. 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/43377c76-1750-40b3-aeba-4e6470fb3e86.json and https://artists.proofprofile.net/proofs/artist/43377c76-1750-40b3-aeba-4e6470fb3e86.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 0xc113d29c3de2f28ec3d9b27289dec1d8fbd69b9a1577b11dbdc5c7a47d1be58c. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/GBWUL2091619.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00dffd68726b2461a5f4fe81ce0ad1520c6a36a59eb822e0ec5b64a5dc8113e0. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBWUL2091620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11c290234f81944df168b6bbbf28683196ab9e6ac9c704ea16498ecc3e3adc0. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBWUL2091621.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7926cae78d321410ffbc22aea3730671cd47fe931d84e619fe5b0c24d3b7ab54. 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/GBWUL2091622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae6455573d27aa73fe6172edfafd9164c71eef3a6e69780cf03e4a9d0e21cd60. Chain 2 (Bitcoin): anchored in block 960163 (2026-07-29T23:20:38Z), 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/GBWUL2091624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9034096738b34ae6215b65726369125a6347563bfc0f5ea47318faa41baaded. 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/GBWUL2091626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf697609cfcc667bf4439a1aa87ba378130a534d8ac2adec53a1f50e7788dd47a. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/GBWUL2091627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a1c34fea40311c7b844efbbf774e6df58724a648db8fbe84fc19be050bf775. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/GBWUL2091629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x900aeb9a28262f18bb95d75a5275c5f9d6dcac463b776396045035f068e83c99. 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/GBWUL2091630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ed5e2d0468329393826357c86569a389decfdeecbe0801d4e8d53054e548572. 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/QZNWZ2224373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b6d60441e37ace51cda49232ba607e9ba5db2b4eabf3228c3201faef4150ca. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/CA5KR2225480.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d0fcb8563af71142508df5d1e1bd6669e6dc9c1601a12e4575c780ebfd4cbca. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/GBWUL2077520.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8299f88cf2ebea7ae54585119d0bf2da9a32851f5c860ee5af3e2106c23d40d3. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBWUL2077530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcbba2662249ca092ab32dc05027f914dc9bb91d33f46a74adaa57c4982b2144. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/GBWUL2077531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32451cb4a46a8b818e6e08e0556b0caa1a30f3261c0caf8df2e93f6d4c046dbc. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/GBWUL2077534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7161c71c22992abcf1bd052e9742661bb8de4efaceccc3bf5a559b5c106475e. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/GBWUL2077537.