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 0xbadd57d06a90e13306ca4dd803f5e4ba6ab60158107e9c7f4b10ee9be24ca89c. 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/a47ab871-b409-4d94-b646-e80688f65d2d.json and https://artists.proofprofile.net/proofs/artist/a47ab871-b409-4d94-b646-e80688f65d2d.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 0x898fd6c8d68888984f0c4ac75155b8ae55ee7e383b5982e119d170f2c955df2f. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/QZGLS2447648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb64d190f632c556ad0ad19493e4a2427036fa34757ccc5f458c94aed336da308. 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/BX2I82400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x362982a9f0abff35791231535b1afc9a012db149e87a87840473c8754e90fa30. 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/BXRK32400012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73af7b42e546dd3f1fbecf960efb23bb9ebaa11733d677040e381998d0bafc41. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX2I82400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x338c3fefcb963c2ab16dda07c60f30b82474da06a40ffb452b514c8110fb8624. 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/BX2I82400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9db677fa562cfb89598a5312fa9ab562d2fba5d0bb8379f4cf18deed5700061. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX2I82400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a5025b8c15e084fd10b67d1375b98dc52bfdfbfa5b7b2be6ed428ff4603e231. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/BX2I82400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf3bbbb4c26d00782812771ef5d38f3ef929db9eec0269a27472b89cc58e4d8c. 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/BX2I82400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f65a31a388e83c1b1f23f50a3a0b7bbda87674ff8788224ee4227008d0e4290. 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/QZGLM2593836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a7f57694521aa53cdd60e518d62c40dd4f65247bc38c335a70d38be2f5710b0. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/QZMZ92436079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bee25bf95d326f970b26a117a17a874e93c3b27bd1a3758d2c87e56a67d95d6. 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/BC6Z62300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24810bb3862ee918acbc634877b1e1e50e33d464c5770e27bb2024e932829fa3. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/QZHZ42136209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf05c55ad1f054faa47884f54689bd23485f82acc10cbddba945a69c25653d6c1. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/QZHZ32160231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd52dde8e975dfe53f3c9fcf8df6dd31d3ccd72b02362a277012ad3035b488ae6. 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/US7VG2103342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15a02bb1ac9f6643668720dbb351b9201cadd8465be2a155be0ba9061a0d1bb5. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/QZ5AB1730835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7c7b292d8e458585c0d4fe43b74210cddc98b35c3613b96c38e6367e5bac0e. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GX53U2097593.