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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bba74db8454fcc153e8f437eda83c5c6fb925031896ce05838f971cf68f5f78. 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/5454cf30-f830-4968-aae0-0a52f43b0d50.json and https://artists.proofprofile.net/proofs/artist/5454cf30-f830-4968-aae0-0a52f43b0d50.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x639354bd4058f3619261f9541d6027a20a7a097aa5fb9c40271de8b6f3bd1f40. Chain 2 (Bitcoin): anchored in block 956841 (2026-07-05T22:14:35Z), 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/UK3AZ1926291.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cedd8eac3c738b7a62d9edd751ae3c1b2bcee57b185f402dc5dde3ce93cd8b4. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/UK3AZ1926294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf46c3e3c1823a713bd4f18946ce89f2785970df82440c89e04b35082da1e7794. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/UK3AZ1926290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61cf19da9b6d015a3386584a4f1e3deb2bd80e4a9e9f927ec82c70e283e09c0f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/GBLLT2152126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaafe62135d84639f697d6442a46ec36b017cdaaf6fa241a9b8ebcab00a9b62f. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/GBLLT2152127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bbd0006d49100be4d86d6041af055d6f3e50bfa02a79d53353e87c5de52d699. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/GBLLT2152129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaa4d10e6bf06ef9cdab48ef1dcf8c3a0058f8dc511e12b936c39fe28d2416b0. 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/GBLLT2152133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb8eb473baf774c2ad0db1e3a80192503633d963c3879db795f7362fd21984d. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/SE6XW2242742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328c8bea9b868b476d4e34bf481642c53cd3e340f3ac3cb9c63a6621f1918357. 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/USLD91742697.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7519c0d1d9a914288562e27d05374661e7a1010dba0a6c4a542d0ac9f0060187. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/DGA052392401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcc0862aa2be7772ecaad300966ce273a3ee2db49033a2f5787e93ed74be3b0. 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/QZQ4X2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd98c84c4a27d81539960a797e03f95c9e4cd7f673abf84a7d6f319edcbdd56c4. 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/QM4TX2351551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6bb36d03a285ba4f962ea518dbc44f7caa24e6cf725c1caa3defd25eb00bc24. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/USA2P2349407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7660435b8c2328ddc5b5147c514c22a75b8ee2ab80b0619f30cc0fbd6fa01cd6. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZHZ32193310.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73ab62cc016ed99f452434dd86d87a416ad20660a1c58c903d581dae41cdc490. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNJV2055451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8a566f627690b0354f0bea4c9db9c544f5b5f76f6d291d3246be900ea1cee6b. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/UK3AZ1818811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf30bbf5ac5e9a61c74e16dc5bc95828ea5dc81cbe678675a62a1011ca9aa679. 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/QZQ4X2100015.
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