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 0x0e0e07506ccb187cf3ffef9ae919b06b59595d068abcacf9d60919fe25f495c1. Chain 2 (Bitcoin): anchored in block 953648 (2026-06-14T15:20:52Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/43cb6e6e-1fe9-4433-b734-09856480ea55.json and https://artists.proofprofile.net/proofs/artist/43cb6e6e-1fe9-4433-b734-09856480ea55.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 0xad2a56565de0448b01d7047e09451c9482982dab21b49b8a99a78dc23d07712c. 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/USANG2283392.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac30baaaf6100591151f0572e173ebbd18cb22b28b193e1537a5fe89f70ad76. 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/USANG2283391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1df572fd353b88f1c96e7aeb596d8b807584a93999ca793b00092eaf4792c24e. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/USANG2275426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd78c4626aeb5728c536fabc296e624f01882b0e9a7e0745e922f9eb4cbfeca03. Chain 2 (Bitcoin): anchored in block 960247 (2026-07-30T10:42:33Z), 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/QM3DF2203386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7ba97b430a051d79567e5acec4f810972e44ec1d19852c38a592b47948f769e. 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/USANG2234866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9b0d10a5c4f4a2f69e5d7470474a2e0c23405d01103d7db66d296c9a4d76450. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/USANG2228664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8e86967be2a8a25504dc2141f83a941d7526fef1bb9a1c904c9d39d41b28d63. 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/USANG2218769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8abb4100a8964da26bb02c3705032b0745aca4f12a764ce3918d6a436d85e99. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/US3DF2248588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3818182b3010e11affdf7ad07f15e488ef16cd2af7cd8dccea1f3f9107d11c4f. 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/US3DF2265650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b9fc5afe3e602ab0225b015311055bdc81a684c0a56c126e75d5f736fb884ae. 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/US3DF2258268.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d0f73de32bf36930f5d213e51587525bde995cf13dbbdd27268afe3222aa214. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZN882215550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x360c5e5d41cc46872f85dd1aaaa228ded802675182713a810fb03b0b22f35d07. 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/US3DF2252279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32dafef782296234aa76ae695cdeb97a4863598cfc355d3c098ec1011d800c5. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZN882220785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc57d4f6fd366a54ea8594d513045cd5362e6c2898b5716cf2953d1c679f009a3. 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/DEQ022290556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c43df882a2713030b0562b3f528d98d0e4acf0df872995c623323dfb7593c53. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/QZN882200138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf41b2d4d323d6760ba5894c5b9f547342f7fe1a3aad1769acc3523f1b23db24b. 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/QZHN92155838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89ef6bd8e1250d4819dd497ac415e801a4daf60f202b7970fca3cfb1561604b9. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/QZHN92120029.