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 0x301083b96b96af35b8afe0566a0f2be4df24c2e2183f8abc8d427cbfe3fba8ae. 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/cf81bbdd-df05-42fd-af62-1732f01b1ea8.json and https://artists.proofprofile.net/proofs/artist/cf81bbdd-df05-42fd-af62-1732f01b1ea8.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 0xffb32f04e64212de7434ebe637b3637d8780014914018b0e571a1d3e810598ac. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZK6K2540414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1be35111a4c4abe580f5673c4d27ff77cab311b9c54dbff6cd4c569135aa451. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZNWZ2263104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea819a0310279f29c539b2fea407500c2a4f02cf2b4fc2081299a42232e042dd. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/QZK6K2540416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x927e126a565722c4df7a8ee21d0dc7e9d0032cbbeee16f1b71e2aac4c1908439. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/QZK6K2540417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05261210a8b913faadbf870424b99acd102da3ca653698350d303c3d8b55135e. 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/QZK6K2540418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f509fd8fd3ec3d16fabd8235e8ca187600ed0b311dae04e630aa492f9b71f3. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZK6K2540419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ef132d209e50793d5b0540f8b9565fc2f3418a5addd1df7d25a4ee178a668ad. 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/QZK6K2540420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40bef2319fe81d91391a74bf507a43850ac1ea80280944319242210ec6d1739. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6K2540421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe545d979825233964559a11ebb9da0abc3a67b71adf9c1c5523ee8e1aa63e57b. Chain 2 (Bitcoin): anchored in block 958965 (2026-07-21T04:29:05Z), 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/QZK6K2540422.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x878c164854d89e0298c6395ff1780531d25eecdbe28eb224c22dd0320dcb78b5. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/QZK6K2540423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a42387bb22eba769e8c6a8c5e6381b8d222cbadfa7f079d5d40dd63e5788080. Chain 2 (Bitcoin): anchored in block 959002 (2026-07-21T11:47:29Z), 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/QZK6K2540424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd79729ff59cf8767c85295d422450f9f001ef7688b69537e41285f884b77d9d3. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZK6K2540425.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d7035302924c60e4a10b31a0f871d9b034b49520038e4a2881828f21ce75278. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZK6K2540427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d9108ac4299c1d10f6ea71388c584abfd954b27f207b9c7c4fceaa88b8e0520. Chain 2 (Bitcoin): anchored in block 958985 (2026-07-21T08:39:15Z), 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/QZK6K2540428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa33077caba347a2d71d2866c98b88a7cd5ab5c93bf09dae9f37538f8e7b6ceed. 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/QZK6K2540429.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf799ded2b7cc0f4f334c5e37ef96c9297d78fa187d1eb6f810834873326bab9d. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/QZK6K2540430.