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 0xc5e1e24614e3da57c7801a9b86be185e7e0e220212aef796c1f40d76f49a23c3. Chain 2 (Bitcoin): anchored in block 954549 (2026-06-20T10:56:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/a9e89ec7-e985-4497-b3c9-1dc76fe00550.json and https://artists.proofprofile.net/proofs/artist/a9e89ec7-e985-4497-b3c9-1dc76fe00550.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 0xd1c1383e06acdadb956168de2030c31b881ff269941ca7cac1cb18b0a0e56eae. 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/DKXJ22000602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5e7ee6d85eba00c1b3e829473ccc25628e8951816340529611d1205c58df0ae. Chain 2 (Bitcoin): anchored in block 960487 (2026-08-01T00:15:43Z), 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/DKXJ22000603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d1041ca90edb38e7465fc07c6b0b25b9f1ddce8df9d46dfe3c635e8bd457db3. 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/DKXJ22000201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d63640eb00a4c8b32d575125cef1073f931fbe4f59901bdb50a2e75c28140f5. 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/DKXJ22000401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11deb0922fc316cff6004144ed19b2effba2dfbdabe61dc65dfafa3ef6b62dd3. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/SE6XX2174195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc15a5e185ec475bc2dedc6b92802e99cadda0ded25fe65ab22678bf8e3467e3a. 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/DKXJ22000901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9087ba8a36494db3d4e31689e33fd3bb8400e80260745d77ab853995ef2d85a2. 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/DKXJ22000701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75fc4265830e0ba852ec600949309806cc464740d0a0dd6ffb877d013adb198. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/DKXJ21900601.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcec10df3489a468663f3b7b882c50352ef2b69ebcb2117896ef019b7f9eb59ad. 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/DKUM72100067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bb26b289867d31f3b3792f32eb20ddc02d4f72598143262e4d998eecabe59f8. 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/DKUM72100068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe54f5f29cea6088fb11a8749d0e6d48e208c1f3af0ae6e2fe0e4e44258399f61. 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/DKUM72000215.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x752b47d64aebf47d59a83f545996b8a5548c78c9a6d48c16189b09727d98ca0f. 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/DKUM72100069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4c2bdf8fecd12fb7d91e8a356e56cad6a1cf3d59e0ab421160002c265896f6. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/DKUM72000841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4c7c5fb03c982f9406c5ed30b767bc07f84643c9d6a6f46668c1591c9bbe255. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/DKUM72000842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9770f7ebd2d2aaaee113e91d200e00a3cab6c4a20e69de813c79c5cbb625045. 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/DKUM72100070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcfc6c2117e9f44c875a89e685334b5f7cc4fe800a8117949c19112974939ac09. 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/DKUM72100037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09fbfcc9045cd5365b27a4b82073a50252b010863eaa5478aed9d8ca0d28904d. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/DKUM72100071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f7942701c8a6bf5c62c58d94b80ce93827f3b1be52624c5275c478ffb0b6845. 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/NOUM71800395.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda21126a962755650688d549d54bb1a3ed47c7845776c92b741d844f83e2c13. 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/NOUM72000106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12dd259d4ebcec16bf323edffb0c5d457bcfddd67f1fbb831dc59532f54c984a. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/NOUM71900364.