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 0x74a7acece08b820c2880b57c0109bcbfe878c5415b6da3acfab426f3b9ee1b3f. 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/eee87c2a-c8ae-4273-b709-77db4854ef0b.json and https://artists.proofprofile.net/proofs/artist/eee87c2a-c8ae-4273-b709-77db4854ef0b.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 0xc22cd27dce7984165f1b1e33fef38db9fc1abfc59b54a5e7d89ba089219563ec. 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/BC3PG2304236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d56dbafa88617e8d593c622cc96405a7e5a5353dbef7b0f6b78e96ac61d5522. Chain 2 (Bitcoin): anchored in block 957820 (2026-07-13T07:54:01Z), 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/BC3PG2303985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37df5daaa73f2acc76dc6471be19fdfbd5caf561ca64fcc87a0ea609e6dcb32b. 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/BC3PG2303800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe42b626d75a6f947251dc947a4aca5a95cce4df63d6fb57a10896d7544fe8816. 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/BC3PG2304101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03ffadeeb45df304511c4ae949d6da19e82f897c65215281f5d9e3e079a03c60. 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/QZMZ92487685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70d0a3e4a76c0d48f0d3c3f726caa455e80f2142fd8b6d6f256b8f3a6da4e440. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/BXIV82489880.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98a566d217a4b2917b7b530da97b282d8d52054c297c4dfd4252864f437da4a9. 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/QZW9L2370610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1043b7731d3de011f5920e24b3d78fc8912ec6b742ccb2ef99e4471117e9a3e1. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/BCKII2300022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a9e3e65dd62cb0a9c8e2e64ce23a22b9ef3fb24eda8c1ff37269f99da6406e. 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/QZNJX2366839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x350f175c3b52776697ace2688791f44001413e12a7162eeb2549b26990c92a11. 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/BC3PG2304257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cad176279e50cbd0653b60ae5f38b7f8161779c9fa1964f41ea7cf3ef9e441d. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/BC3PG2304328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37677fc51e8974e402a221a1b4534658a7ed069accb7456bd0e1574202568adf. 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/BC3PG2303970.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac1102f1d96384f8b5c6ecf3c225f49cbf61a238afb58f6fba7cdd79f972d543. 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/BC3PG2303495.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa48c45453a6c4d325d4aa6aa399dbef232a1d18d42019d3b929ef70321d87cc2. 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/BC3PG2303820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x477e75c43cf109c03696f04086f48fb9336ff00f5e3a479cde36006b1163b5aa. 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/BC3PG2303487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e227710dc628c85e467d0d5b10688c3a6cc7efda2c84122439563b6e8283a00. 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/BX4IU2304315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d054db820c8298fbc69054f805c7913ec4d87697df134192537f98f4b8ad266. 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/QZ5AB2314653.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cd840f98387583e8eab3bcf96a730993ee0dac086ef42570aac0c30b839457. 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/QZ5AB2338135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf46c49d604bfb79384b1e04cc708a3e13b9141ac74d6836a82acc60ccd7a135. 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/US7VG2395933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc84c092264f2569c9e45681ceaa0d7cdec525cb4a48098fc602c344df24b21b4. 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/BXIV82352428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471a9488d749cf4139d96b2dcabb0063a2ef38e3115bfeec12332b531b0e1156. 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/BXIV82237262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81eba01db80fbf839c47136c535e9a5f00840855b8060d669ca35e6c87da7614. 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/BXIV82288068.