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 0x77af12c0835e6477d0fb2c8e6a3a00229e083eeb74d5b9100930a8cfb485c286. Chain 2 (Bitcoin): anchored in block 953694 (2026-06-14T21:38:09Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/6d1eea5a-5ced-4a83-87bc-d9c721e5ac81.json and https://artists.proofprofile.net/proofs/artist/6d1eea5a-5ced-4a83-87bc-d9c721e5ac81.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 0x12be4c7883d17f759b1a7471a308d0fd428367a81dfb60229e629c9081effdba. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/SE66N2262913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd06d9cc431dce8eadacc612956c504646ad7af28754cb94f765301382020f08d. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/SE66N2262921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf1e818fc94f0a72ee09ea90768cbfba83c19969a637e225fdef079819f1743e. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/SE66N2262927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b0a774b5d613f1fcbdb49016a40517132e4e88d60566f668b75ffc3164b3732. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SE66N2254345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x842a681f9dc97a4094821f31efb46dda2027e9b71849755a11eb4dc9b8a920ee. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/SE66N2254348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf918461146a2d516418cb02c56cffe579f5ca82ff1a27f970be3379242bfe97b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/SE66N2254350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe03345e6bd4c4ab08fd404518a3fdbc9b15681c87f9699819cce1cc3060b35eb. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/SE66N2254351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2937262f081594f03fdb8dc58a43dde53e72f94a19638b8cb8b7e4acb366e4e3. 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/SE66N2254353.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c299ad37a00569b08d7228166d3ff03d3501b65fa7eddbcec6ee381ae43e8f1. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/SE66N2254356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c4e44440c0972bac08ff02e4ca4dfd4516146dc800d214d8a93a2047085077b. 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/SE66N2254357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40e7bf19911d75eb8e6464e4576ef00c3091d49ef1681ff0dbf888de745013ce. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SE66N2254358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfb8f6553268e8325854012abdcfb6d9ad9f4e22303d66c6c5aa87095a1ce020. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/SE66N2254359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e2be6c9d363254172b6ee30d0c1cbda66ef1b7c1ad0278e92b2812e6e0cebb1. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/SE66N2254360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa258a5b8b8dca1be7d3d86cc422653949391d858a914d326a69d41532e9e94dc. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/SE66N2254361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e9019e464f64d6435ba111eb37d785c704e76714d592d5517ff8e4cf225d3f3. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/AEA2M2249872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x098970da4651ff935d0c3cbc4095301197075588d273370ca8fde47db0405f71. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/AEA2M2249874.