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 0xa222ae156658e3c72fe41a0f97e3cabef9ff641f10aeb9838f15178f6173811d. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/065f942a-c25f-437c-8a15-efcba164026b.json and https://artists.proofprofile.net/proofs/artist/065f942a-c25f-437c-8a15-efcba164026b.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 0x1ef6b4ac022cded7b3307345ff972c2856c4772437d2bc8791ca35d149695b9c. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNMV2076352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cc1851871cb9024dfc350a9ce2f2207d6c18de2080291882cdf034e50112d79. 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/QZNMU2166187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb72b1da2c4260f42cdeba91bbadb51e678d23aec74ad1f1dd07d5f2ff1b25f60. 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/QZF8N2117135.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d332416efa5f88731b89a10a09cb0663c77a217f537c7e0de448cda94db19c3. Chain 2 (Bitcoin): anchored in block 958891 (2026-07-20T13:27:11Z), 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/QZF8N2167408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x712b031e0e4df304875bee0adfd07bd470c7bb8711c9953dac6b872de91e024d. 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/QZJG52145554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6456ff80907be8700760bf0c6a96ad1686d3d5416dca14434510d461ea0eb0d6. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZJG52179178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48f4391dd4a5768d7f3e55d8669fe0904031322b4163a152151e7818df65038. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/QZJG52157564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5599ddad0d8025c9d2f9f69ba5ec7f0164fc5bf6e6a8b9acdf61652feba8abb. 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/QZNMY2167909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e13e975b1cadf3ca37d30df792ff8f02b516bd6ed8efa9aeb0f13ab0fcb5067. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZNMW2150271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe48f4391dd4a5768d7f3e55d8669fe0904031322b4163a152151e7818df65038. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZJG52157564.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1eae3e003f855c95e6b591bf34c2dff52f34997866e4cc3fb89c0a9286838369. 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/QZNMW2150273.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b304b508e0b803a9ade5c619855b06bd3ada4df3a76d3805dcf572faa9426fe. 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/QZNMT2241011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893624f0b84a6f6087ac9428ad7e487a1aea22f7a26536a2e9c2c687e5db908b. 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/QZNMU2299445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdd7f605f79f88eb34f3df64b4a949de4bffffef94d4fe4d0d939f33df1e2bc4. 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/QZNMW2252771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d38b80be595d48a1d438ae8c11ea0f7e5ef27117142ec24e6c3f24cb012538c. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZNMY2201111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xede37b67017221ff9491c2053452bed1786256e786039055761916643799736d. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZJG52410663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac26725964e602dd01f21e604563f25c20ab8d8eff7b040e2ed41c62adfbbfd0. 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/TCAII2486097.