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 0xe430c3581189470929cde769a56c685b961ab6d641cf659c9662df2aade2580e. 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/22da6625-62b0-4c9c-9006-dbdd56551718.json and https://artists.proofprofile.net/proofs/artist/22da6625-62b0-4c9c-9006-dbdd56551718.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 0x5a2d0d3190df94906aac680b5f86861ee56953a7016a65bedc21811fcdf25a01. 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/ZAA641500024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6850413672d2a1f237a67017b1b5a349277df0afa38ee9f5c8b0cb7a92e163a9. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ZAA641600017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5df727026ea08ef71391c8b82b6bd45b6dc6e6dc481ca03215643996013e2c36. 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/ZAA641700066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1520287901d29aa8a3960bb88c534bc25f6e46b1bcb1ae142ee56d3ed7e3808c. 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/ZAA641700065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93cd72188755cb126c7f55900c6f0d3591d2edc448487d4e1189f52669824ca2. 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/ZAA641800025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0eaa5a0d67ca24e40fc3ff70b1cef1d7c7d8fd74c9be1684ddccdfd7337733ed. 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/ZAA641800015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328b8452c261ffe59b66530c1a28bd22844cd5684d81092aab5b8755a1a67262. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/ZAA641800026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6e81549712e07307590302e21fe9782815afcd79e7e93edfa2bed3979dce009. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/ZAA641800027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eedae37807e32063c2021bdf508ca45299665099c18fa15619e8aa109578d44. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/ZAA641800016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ac338d83b74aae3833c48abbf67e8bc18e4bc7973526cdefe0da7f73a9e8634. 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/ZAA641800028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf648b7d3328c118483e8efd94f96f20150debd820d9841385bef06be3709c468. Chain 2 (Bitcoin): anchored in block 957061 (2026-07-07T16:07:00Z), 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/ZAA641800029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb63c643553794a131ebac0c7cc779148e694fe977dcb3dd98628e350aa3a215. 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/ZAA641800018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x871d716d279e8f6bb10ca9d5dfb0dea14c407635e69c6dae7c33297fe74524c0. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/ZAA641800033.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105d44c69966e1e089ac1919bd064038409d5faad1620bd8ab0014d22d3a99ee. 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/ZAA641800022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf1e354d5a952f56c0b05153617de18354eab35747844e014d41fcdd6f09affb. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/ZAA642100177.