thumb|Slater working on a roof thumb|Cutting a slate with a slater's hammer on a slater's stake thumb|A slate roof A slater, or slate mason, is a tradesperson who covers buildings with slate. Tools
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 0xa2d85df1846476d602a785b38f8b8dc13056a89dd595e90a89e65da658847112. 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/6f8ad56b-d905-4ebc-b01d-c116937b9aea.json and https://artists.proofprofile.net/proofs/artist/6f8ad56b-d905-4ebc-b01d-c116937b9aea.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 0x082be2387f55293df92a3702ae661c3b2f9d4289b1f65092dc46772a68497f28. 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/QZK6L2163085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1200ff0dcd7268dc4a30c175bc0d13fa6e4bf8714347ead9a163dc8946f4fb28. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZTB72322818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x451a9ab7ca0e3c12b961894d23fb8e9b4fb1ccb9ae192e63bab05564d5f49d7a. 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/QZFYY2356856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9015770b67f062f7e6d6e911358b0a48824e7621432ce014bb280a31cac16a30. 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/QZNWT2352577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55f63a33516415401b9ec5b8acf5b310c94d6a8d67e71eb55e1f8d8a319049a7. 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/QZNWT2352578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b77a02c9fc658c3bfecddca80ee2ab049dcc73f6f00ae96567517ad94cd459f. 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/QZNWT2352579.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43fc9cd808e5615182a6fb4fb7ae937aa7c9e3055397332fb427fda54d24b13b. 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/QZNWT2352580.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5368e7d3dc1715a1466d4b5e76cc5f54a638820c12ec2e9fe4a2353cfb777793. 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/QZNWT2352581.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ed48aa93cfbd63406f608e195d61e2cc29878f84e318ffb1c997dc4ede47d9e. 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/QZNWT2352582.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0faecf8ff728ad3a9b365b2771218ce0b35b87afea6119a0dc41329808c9055e. Chain 2 (Bitcoin): anchored in block 956861 (2026-07-06T01:57:57Z), 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/QZNWT2352583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd14753e36864897f49534f7ca058fb6399f64b1ff546e45856562533dab96799. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZNWT2352584.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaaa11fc724c89001768283831b74be50a3036bdcd63c606590b2ca210e28983. 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/QZNWT2352585.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02e18239520bebc87d85da733da349b82abbedf4cd3fb0a4990cd3d94a42b0d8. 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/QZNWT2352586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f96e036fe8110f897393e795a4f30cb031cd1cb91286e18c3862c9c0c48cb53. 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/QZNWT2352587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5705f8f4f917dc0afd75a26a9992778e4ed579989810138cff56ed152b3165dc. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/QZNWT2352588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0fa1b1e29242e4ede7f31c68368dba439dd56aed5acf34c6cdf8657028acc7. 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/QZMEP2054025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x245ae63f743dc2f1479179debc5e150c13d84f79507f21aa48590e1ca45fa051. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZMEP2054026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f7fa7e5070887338fc69603cb4bd9b0184ab59a8183c8a3cdf1a2025b5d78b8. 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/QZMEP2052817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa4c5dbdf343a5b7e49fa3cfa3c7aa0776e07e42eaa1eb1eaed77f830a23af1. 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/QZMEP2054027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe846c640c8871c858426cca18563c87fd9280955f57d33025ab787e906f07e3. 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/QZMEP2054028.