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 0x31984dc1c9e1263b3326b32c69aff0cdb5a46b44be7e4b08696d24649b0d7917. Chain 2 (Bitcoin): anchored in block 953625 (2026-06-14T11:37:06Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2bb30b2d-2b01-42a6-80b8-6de11a408c84.json and https://artists.proofprofile.net/proofs/artist/2bb30b2d-2b01-42a6-80b8-6de11a408c84.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 0xf76dafc1a7eb05ba44ae51bdb34772a70c20dc41bdc7e352514d755f07c06528. 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/SE6QE2454217.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe44f84887651591ea8ca122e715fc9bec26609ea768daaed208407ae9af45228. 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/SE6QE2454220.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5560b68f5165fc6b08ee866346551709e2731d81e3a5ba656b389f03b07815d. 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/SE6I32473947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x429f9bb06530fd905761ef1b11b2c0d1b13914085aef18e07c342a3c4e6bf5d5. 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/SE6I32474058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe09d8cee6344d1ba022f84c5635ed78dcfbe96e7ae7b3530509487522b3d6210. 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/SE6I32474080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73941d1d20830e2b6005fa3ce8ebd22465420fb12120fc93860c8e8fb209364e. 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/SE66N2393701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2684aa63477d4dc1ca3c897efd0d6ea50055fad0d0c73f0a0add6379412884f. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/SE6A92368775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x660001bcdcf3e67a32fcfb2592b43cb97ad8f6aa7c2c3080788f8eee0a477754. 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/SE66N2315674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57e2cd2ef41d9575e3e31d7065014ac189422ad8726aadfd511f4ef2da5b3a78. 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/QZHNC2320092.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65217fc770c3628c48e6f908d1febc869cae078138a216eb98b5d309aeee5739. 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/QZHNC2316628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e29172dd34eff3e504661e1734cec4a923b3b81ea7c14b50dd0d69837c65477. 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/QZHNC2320930.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d22a06d470aa6a302bcba79ca9f6b00cbdb2f8d5a8755514da95d9f9beda3b1. 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/QZHN72388756.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979c2bbbde96147a9a6f590e22d7a638d620b4333bdce21fdcf8bfb36f1a19be. 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/QZHN72310572.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x005c7f657694f365db19817972511d149d26409f0521c1bf68c0058b0a5bbcdf. 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/QZHN72387251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7da1d6a8ca4a51f106e88d536d5f0106e614bda1a052c060d2851fae9ab67b7f. 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/QZHN62313302.