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 0x0598a39179957871c423765ffce6b6326ccd5bd3f0b1549bb6c4f8958e7090bf. Chain 2 (Bitcoin): anchored in block 954667 (2026-06-21T07:29:20Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/df49ebe7-03e9-4199-81da-84cbf054a27b.json and https://artists.proofprofile.net/proofs/artist/df49ebe7-03e9-4199-81da-84cbf054a27b.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 0xcee0b7a98f3db8498241fcccdd2c6e5217491dfae12516cbcf6735897a42ec98. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/USCGJ0639905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0506d5310f61ada08fec3ea0df31a81965a31f1514ac8204c379002bc4cb3e0. 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/GB7RM1300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd4eff1eba57dade8a3c7f615a0a10999afc7f5254d3c000833d7e02872c88df. 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/GB7RM1300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x359d63fb8b7f020a59a46f9f3faf2c497b6f0102658962d22ac3f7f8b67d5086. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GB7RM1300007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517a055430774637daa7963aa8b209f9d049899fdbe9e39e992275fbe7ce01b6. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/GB7RM1300006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b84d4af66395f714c38f638da07efa75916fa3855284d9b02af812b66502d6f. 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/DEH840700263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb994d829e576c55040b77b0fa5b9f8f73dade22d1b6fddca45a415ebc06830a2. 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/FRZ057500040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d2c5e4804fe2f89bfcb4e22b4c8ea76ce93034ef976516d31a48940c3819dd. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/ES7581200447.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d416d834f4759b1234262816de339d0f8f5f44a8bf11471a3c361740327de86. 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/GB7RM1300009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8770c6e6a8781c8e315eaf17cf7734f0d6a1d18f33f0a6b1b8168bd213020957. 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/USMN20605662.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe45e10866c6bb0fcfaea94044475f6a0029db612d6a27e6c515be58408b99c35. 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/GB7RM1300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x862b01ac164b4dcd06f793196e413575ad09fa45dd9f75791fe0aff7639a509b. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GB7RM1300003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3ecd1940c3406bec5e3c210e79014c1eb6fff685cb03a65e19a1248f1d3c40c. 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/GB7RM1300001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0b206f509246b5e9eed43c84376f2efa346264491e72de71c60db59e346ea2. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GB7RM1300005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x747398e7e902773e1911b4d79e095f2bcefda1de3670d9ac818835d502cdd84e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/GB7RM1300010.