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 0xa4b92b984e066f76cbe6ee85c4d704c57210246d7370233ad43338ca4ea60cd9. 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/04a6809f-1f94-40e9-82c4-5a15eeb684f8.json and https://artists.proofprofile.net/proofs/artist/04a6809f-1f94-40e9-82c4-5a15eeb684f8.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 0xb11d4d789f66af4cd51a449467cde02da3f47ead2a6285563b85a29fc2c4b5c2. Chain 2 (Bitcoin): anchored in block 957750 (2026-07-12T20:39:38Z), 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/USUYG1218412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x393de4c66d8b341d788d984212ff7ba64db51a08059740c460aed7da40ea49b9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/USUYG1221545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5623b82a428deb60bcc1db1fe463804fb5aa207191a0464a26eb44877b12f120. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/USUYG1228327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9774b0847fce82ae36c93a6040e5582e0f7f3287143fa4c031d9017fb2985eb2. 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/USUYG1252369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b5934da31a2e5b6e46c9215dfc9a509ce79887290ba5c722dd541485f27b1e4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/USDY42093506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c7e0b5cf65e8dc58a084379a8c7406ba53c8cbab21d978e075ee566c5d6593a. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/USDM32000331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab6dc37f39e680d9442b81567667fb01f4152a41fca8593480a65189a3d32289. 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/USDM32000131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x748a31b19be1630a2f90d517dce98a6befc19a55b7953055e346e1da424a942f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USDM32101032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6637af03aae1876b6d05741fd0065a5380c54958d4c7b24f47b918b5ab168cbd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/USDM32000231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5954cc3676cfac0d67cd8323dc15c69c30217065d1bfd08bc8dae483be74e935. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USHM82171329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a63dcb44f4e4d0ef0416b08b21f4ea6f3e9b582c2353fc26e314ffed9e306c7. 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/MXA2A2300013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x081022a0c29b33c9947981ba299d86a2a28a4baec24fdf7055058632861ab0dd. 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/MXA2A2300010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220374df15078463e4af8700c93313a8e980ea4108ddcb29bfbf77be6be463ff. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/MXA2A2300016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x365ade68527fe9946b11254c28d454b974b57db49c8c58341e4b0aff467a823e. 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/MXF152400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35569e27dbb22cdf2f02cd99c5b56c670c618880cf06b8565db97d1b822b51df. 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/USHM22153006.