thumb|7.92 mm caliber rifle barrel (Mauser m/96) thumb|right|Rifle cartridges: from left: 50 BMG • 300 Win Mag • 308 Winchester • 7.62 × 39 mm • 5.56 × 45 mm NATO • 22 LR thumb|right|A 45 ACP hollowpo
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dfbaf07d51518069cd4184c37db38ca4f30a676dfaa62dff71566f7df84d207. Chain 2 (Bitcoin): anchored in block 953605 (2026-06-14T07:39:50Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/0f85b85e-c1d2-46b8-98d0-3656556ac69e.json and https://artists.proofprofile.net/proofs/artist/0f85b85e-c1d2-46b8-98d0-3656556ac69e.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f316693df1b304af641e18e27b532b66d14553e7e2f8c4d15970762b5ee60ef. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBMA22168529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78f23f935a4d49be2aea9991ff0089dee84efd0961bc652a35d25b8d443dacd5. 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/GBMA22168535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d2518da409ebc1ebe8c78b7986aa19b01df8dd386c40d7849ba6ff5b75012db. 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/GBMA22168560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x400dd2528ea1e3bc043ab5c2e5e3b2fddefdf7285d606604e99444115f9fe504. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBMA22168536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc45d37bb3f52474b7c39d2b9f6771edf2bb1708ed64afcf1a962de16cd574107. 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/GBMA22168543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a61604dbe5695527b99266c4ce67fbfd8b39a1c892066f807d61a3bf0c5df10. 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/GBMA22168545.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x76ce4601556c1946f8c729aa3777e6a4f75b605bd575c906a5b50d9de099a60f. 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/GBMA22168549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e2b4e44f3ff98d4c213f10b6487b232cea7c35c90814f752dafc6920045652c. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/GBMA22168550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x704e02586babbb10b25a5ad24a7af6320a21c34131b0bef4efb647f4cf93aeb7. 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/GBMA22168558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0ef1f82c4769dc80d66861179698f65762f1ccdeacb7de4a77d9549ded8e4f1. 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/GBMA22168559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98ccbdb7b032ba22df3e55590333e00be5b3db643d38fa1d4b25e03b79e46851. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/GBMA22168565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752566d148e9194c840780127b6f56dd34134b07b817f32f07c4696602666ba2. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/GBMA22168542.
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 0x3d39f99a572e171757f78911268515035f6688ba920ef8c4c7bb7a572fdd0091. 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/GBMA22168530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d9b7d5472858ae8f7743c07951a3fbe7d6ab41582c2b3bf1f63434b2386663d. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/GBMA22168534.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dbc381ab46c5a8fa50646c05256610c398e9f140d7ac1c7e26a486fb4473430. 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/GBMA22168576.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6891ec1a79d65db54d6df14b04efc2af6bc9c96491aeb717da1c91a97be5792e. 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/GBMA22168537.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4655dfbae8fdc56f5ba8559d849b8282d2b8daeba3fa9c805767d85b01e4e87e. 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/GBMA22168539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b39d9cacc844567ef811449b392a1b573f8d5ed393e1861202d60e7833d5d89. 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/GBMA22168546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19287f0a6a1825375351803d1912ef96bc7f9f12284ae9f0593d772bca1e2ebb. 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/GBMA22168548.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcd64121e0419cf1530c71edfeaf8bac7fcb8aefb6cd71b7d1a929fa7d99a2cd. Chain 2 (Bitcoin): anchored in block 960448 (2026-07-31T18:48:12Z), 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/GBMA22168552.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95d27c29314269c4ffbfa26e883c2a3a822489f4c520849b2ea6c0bb6391660c. 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/GBMA22168555.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad85a72eb3edffe38a6f2223d0ebd9b402b1bac6ed8cb7fcdf2ca5de0302270. 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/GBMA22439033.