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 0xad1c18c705e9cd885c4b9c5e22f10790f5bde12a3bce6de82b258643007d2f1f. Chain 2 (Bitcoin): anchored in block 953717 (2026-06-15T01:05:33Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/877b3d78-c094-4c6f-9ecd-0929d0c37a74.json and https://artists.proofprofile.net/proofs/artist/877b3d78-c094-4c6f-9ecd-0929d0c37a74.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 0xe2e69f4cfdd809f5eb9d4378a66f0443bdb77eda53cfec87801cfb068b80c21d. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/UKU3N2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefbba13fa4d3e452fec10c7d30094df9f5ee96d3eb84b1117efa464654ff0308. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/UKU3N2300027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa353986b72fdf700f01dead758ccb6d29f9415e98dab108572364d65791e895e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKU3N2300039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2e69f4cfdd809f5eb9d4378a66f0443bdb77eda53cfec87801cfb068b80c21d. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/UKU3N2200076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0d839e56e4fe17b86ab7594bc47bde2818b40b0e90293a4a9ddf1b68769f0e. 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/UKU3N2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24aa7aa2e24594da6d1bb8348d7c7009a427dea59611e78ff641e688f78b78a0. 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/UKU3N2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea62f6158d70f4c2eec040db663460638693be1f791f83272c323a7f600bb78e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/UKU3N2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba33cba9a7dab469749efdb59b2c76473622557b3161d75efc34b1dfcc18f397. Chain 2 (Bitcoin): anchored in block 958286 (2026-07-16T12:43:37Z), 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/UKU3N2400030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbda46792c3f693aa8e5612a1c389240c74f71e3a8e5f3174a8b8dc28526699a0. 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/UKU3N2400032.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc66d2e1d28b0cfee52895c5af880ded7106b79ee52cbe5e1a8e674da39363a57. 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/QZWFJ2485854.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1fe4663171353ad790a6892e19fbb75b0737b35254eade377fba9d061fe7ca. 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/USZXT2556664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338f21bb2c6fb2c2d0495cdb2a1bef64ba9930335ecd8475c0a0a6cc373c0064. 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/USZXT2557482.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x220ff5b82a8ca354e788bb4a466225cc45595e470472a12db98a3e9434a19bcb. 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/USZXT2557690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd33c994335a16d12c3b9be150f49da1fcc6bcd95f3355b054825f3bbc67baa01. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/USZXT2557490.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c1fe4663171353ad790a6892e19fbb75b0737b35254eade377fba9d061fe7ca. 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/USZXT2556664.