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 0x4d920450add3eb621e6c13fb48ae452f47bfa1b1721e33c8a18b71fc966a6363. 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/ffea6e4c-644c-402e-81d5-599592bbd037.json and https://artists.proofprofile.net/proofs/artist/ffea6e4c-644c-402e-81d5-599592bbd037.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 0x50c0ddb473d855c29bc9c28123d4a5e0481011b9591178fc857b4769a59c7918. 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/GB2LD2110051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd584ed2e14e72d3991042cb8c4f51a3cac6ea4cfed1f7cee2e664787489d1e. 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/CA5KR2429379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d09ce2c586b1ad15cfc15c473d0d070b92722a94e36dc12abffc2dbec831492. 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/GB2LD2310057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc707cb3e136fefb93144108318adcfd57437d5b51529d7ab97b2df559f6a892a. 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/NL2VN2100053.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2539b721b490f5c30a13c617885ce6e9b1b863914f842fcb6fd43f928b14005. 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/GB2LD2110367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd852e0496a228f2215ab2a113f9048c6243065150fd13a95bd2b41c80b952f85. 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/TCAEA1992228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3768b61c82155a5abe02067c7fe77b38afd3af75104f24b51d79421500e150e9. 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/TCADJ1735160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19d68b7fe1beee1b557adf19407e807d6abb7c83e4dfe178208c23f4ebb45329. 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/NLRD51632015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x41390c1a4ef77c916a16f835cf75278b9b648edcd7575fca5878c84a681a30b9. 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/NLRD51630372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38ba92a58cae13de6f86877acc89d205aa148a9260a634dd0776a80a51242dab. 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/CA5KR0042899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafa4eb0fa5b39f2ad681a8c304da30970b426784dca222a1f9a96e450edad340. 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/CA5KR0042900.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21aca6ab6284dafc81952a4f0b88797d5301c37e4d82938cba5cb2f48c83ebd5. 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/CA5KR0042901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073700820982c18dd80885ead7350f98db9aa2f78230ff73f3a635e615605f1f. 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/CA5KR0042902.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07146d5fc683069b25f9e9ffdaeaf4cb2b7f8f4c9ac389bcb4ca68fbb020b608. 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/CA5KR2324023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9114462e010448c5b77b245c79c0a601136d0e20c281dd9ffd127e0d7d90973. 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/CA5KR2324024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdacc591ff39ad86706dc68c3b5cd61214fec779f6c5db9fec0924b5b6606550e. 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/CA5KR2429380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbd584ed2e14e72d3991042cb8c4f51a3cac6ea4cfed1f7cee2e664787489d1e. 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/CA5KR2429379.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2d5e53feec6376a939d4da13e466537f702ccc1620f20567662944e2653a4d5. 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/CA5KR2429375.