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 0x03917c1882f4f23532faf42ea36dcaaf98a0ac91445deb275ca9d63cac8dd79b. 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/160cbf19-8c14-4dbc-9ab6-75e8b30ea8ee.json and https://artists.proofprofile.net/proofs/artist/160cbf19-8c14-4dbc-9ab6-75e8b30ea8ee.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 0xbb4593e17469700232ec3abccbcd3903bd222d5d520b2d23ee34661ca5b898e9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GBMA22563796.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8bc9cec265ac4188a353a0ba21ccbf3a0150a949a4282aaf2ebf8fc301fddfad. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/GX53U2596852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x585ad218783f5d682e40a837248d925db219afe52b3cb0531f601f6487dc067d. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/GX53U2598160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1bb7c7c567cea1af87e09a6fe123bb8f4abaacabad09edf700dc14693c391b4. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXHND2554692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3599192ecb84d03e518d7fa5a3fa7c5075d5992c7b2210ec91f1244be8db33b5. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/GXHND2523809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55d742acb88a51a764fb9985d9e14156298068b55180aa50b7cac1177cf9f3de. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/GXHND2523823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60fcf32de023c74e64d658e30388c251593ad41df03eef634af9333039744848. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/GXHND2523816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b35e18a79483f45fc90304000af3e1a1f7958393fbfc4046a41be05a95e1a02. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/GX53U2662666.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3be7e7cdaaa4c1e464dfec378150eaa9428f135a0b5d4e30c1fd6f1d7df7fcc. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/GX53U2662802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x635f63b09fd0a07417f3be28d99a0fdae812560ab8f55c9fe4df295e5866e5ad. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/GX53U2662822.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aabcb10cf23964087eb8b775459e1a56f1d615c0f5af2f367f3a33cfb3c1623. Chain 2 (Bitcoin): anchored in block 958867 (2026-07-20T11:08:30Z), 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/GX53U2664129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x188b7fabd6c9272d1f43ad165c2efd926e7ad9e299b89ce4ea02c6883efa2ec0. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/GXHUT2512465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8e9f0ba02a565e3fd25f453effa2b77f8bfcc40c6c502a8b9a3893ddd5d2b5e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/GXHUT2513281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0a947cf74c1d1da6a2d85df4a3ffe54e36099642c8b3031ff680d8f646d3692. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/GXJ8K2510622.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa84ba7e2e9e17c24f6ffbd6abbbbb850516ade05c860217926f2d0f453fc4d6f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/GXJ8K2510563.