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 0x9a2d9d9c393745fd9b1a131efb798ebc5ff1fc1d49620db94ac0e050e193fe5e. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ce1b6f5c-ce2c-40d6-a9ee-7473df2e6a28.json and https://artists.proofprofile.net/proofs/artist/ce1b6f5c-ce2c-40d6-a9ee-7473df2e6a28.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 0xf346549b5cfbc28c7e743cb3a8eb85e468570afd836ebbde440dd71998a68731. 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/TCAGI2232135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x50345bc82bbc443046891efd1fc7613515038367ee13de2f1cecd27cfc623839. 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/FR59R2248598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60b0485a51029303ac10101c9567ba4666b6ec6eaa0ba658b11c17d9deeecc1c. 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/QZW9K2267795.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8140c02e84cf49431226c58ffb890e751ea1c981b5746d749358fa12e28b3390. 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/SE62M2192066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc90b24a7fe55453959836b05dacf69aad7da7100d201a387487bfaa7491ad4d1. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZTPX2488899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc012414c98fe46f3818e4ad7d328e93c178efbd860a3941637d870ed52e31da. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/SE6HN2066346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54868d5f441bf057e64e295f00329016083a10136d71f4b8d3036056ac7264d1. 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/QZGLS2390558.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98b220346ca5c84f81cfac25f087e86e20c29032c0aab738042ff5d64faa78b. 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/QM6P42199122.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdfed155f4b8204fa307a9587d72e23953d6782d313f66b0fd4b90cab1947f1aa. 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/QZMZ92005879.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862b622b5676a180175c400c6c1132eb0c44d51bdd79da89edf9c3c7c5342ad8. 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/QZHZ62078553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc58c30066bead7fad7fc3dfae6887e385614c89640b00d06ea8662818c0e1885. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZHZ51962393.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54a0e7f2c97bf4493c7b2d3714f8d8c4682c8363872dda167e2120774a8aff03. 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/QZHZ31937001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00ac8c919f25160407c702aaaac6aa0fd77047bbc35ed93903bd350cef9ad2c5. Chain 2 (Bitcoin): anchored in block 960229 (2026-07-30T08:30:10Z), 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/QZGLS1923682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x829ce73ee277bdcf451632cda5da9c8cbaa8af492a628e395c12471ba447b32a. 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/ESA011826071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x277d4cbdb2a55f973c4baac9f70fda2b182fefca164db60a74f6b9f7f28b58e0. 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/GXHAF2552775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ee39a765cd8dcd924db6e3a9461d5bfcba3933331b323c92c263392e4af72e9. 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/QZHZ31978370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8f860ce05f084ee1587da2e45437ea63040642cbce443577e821a26db5579f3. Chain 2 (Bitcoin): anchored in block 960111 (2026-07-29T13:21:01Z), 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/USDY41515633.