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 0x403132a7bce313ac127f52ade796a33ee363ce70a0122dd222071fbe82b2f2ff. 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/b3c97750-5f4c-47c0-b2d5-bf59b5b4978e.json and https://artists.proofprofile.net/proofs/artist/b3c97750-5f4c-47c0-b2d5-bf59b5b4978e.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 0x79a5a11f716de8ade34578ae781e53064d532dd64d213c5d8fe041503eadfa8c. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/USANA0405602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc68d7bd189d7ed751aaab96028f759d2817713b50eb1c0a10d296c178761eca. Chain 2 (Bitcoin): anchored in block 958746 (2026-07-19T15:36:35Z), 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/USANA0405603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb51cd5c12485f0c358138ac7f253b74cb42af706939dfb068600d6a7b723aab0. Chain 2 (Bitcoin): anchored in block 957759 (2026-07-12T21:46:51Z), 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/USANA0405604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x00640a702110168bb5bd69386927e235bb54deef9f3445c208d5c233e1c3e3dd. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USANA0405606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f13d6331b1fe0e621649de704123475680be2c7715584a297043d8eb0cf6b67. Chain 2 (Bitcoin): anchored in block 958166 (2026-07-15T15:55:19Z), 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/USANA0405607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6652bb232d5a94b3eddd3cfd1f75abb1d3cd248fc23bd32055c36b79609a2067. Chain 2 (Bitcoin): anchored in block 958420 (2026-07-17T13:33:01Z), 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/USANA0405608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7969f434b8b88ff4458778b6672b4c5744d32f9024dc0b38c5f9158e0a8af77f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US6QK0900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4173b8365de38ad3f918d1435da62af920f915e99de6a6a526b416578e38ee9. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US6QK0900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db3461452ed98d6e832608b89776fe6e455c1e79fa84d792f4cd2bbd62b1a41. Chain 2 (Bitcoin): anchored in block 958376 (2026-07-17T06:41:00Z), 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/US6QK0900013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d98f02912f381d73095b0850aa26438305398d9a6e9a3eed43b9ec895cc8ada. 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/US6QK0900014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9151de980bc1f31d2bc9e862b741a186eaf9c989ed6191ecda6443bec0edd3. Chain 2 (Bitcoin): anchored in block 958880 (2026-07-20T12:33:53Z), 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/US6QK0900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71f9a2bf37df2c4afc40db36001944743aac69c25d20669432ad2ea5197d18ca. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US6QK0900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ba1524d5b272d156cc65020df278f87a5c7e05a08eb04be67ce300881b97e9. Chain 2 (Bitcoin): anchored in block 958889 (2026-07-20T13:24:39Z), 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/US6QK0900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b5c9bae6ec1e16823fb760c253d82dc397253ca545c79814bd0055728b13266. 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/USL4R0763560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f500e571205b7129d4c380502a67bf632d0d4954f4eea36e3d4afde1e1148cf. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US6QK0900023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa777ad0a695c9a13b4f1bde1fef42db0fe1a76e92989f6ef3027b4e1e1886105. Chain 2 (Bitcoin): anchored in block 957026 (2026-07-07T11:02:43Z), 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/GBWUL1904662.