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 0x7e958f3c945da3c2cfbac2a7145680c8f88533b5f4399418e02f57bd52efbc96. Chain 2 (Bitcoin): anchored in block 954069 (2026-06-17T08:30:25Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/7ace281c-8b65-4a07-a89b-8fdf81899277.json and https://artists.proofprofile.net/proofs/artist/7ace281c-8b65-4a07-a89b-8fdf81899277.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 0x430dedb760cb383a54cb616a3db0f06de5e3594e82afadf07ef3d5e988079779. 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/IT3GN1800070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f22621707425eee39fa5099737fc0b4f353d00ab4f66222833e646a65095f31. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/IT3GN1800071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5864505d9b94a5225e5cade39999f2e873713af89c4e729acfd0cfd80197b737. 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/IT3GN1800072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1818d612069970bd6a38187985ddff51ce62363d2f045c56eca8d13b554edfd3. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/IT3GN1800073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40d8f7c7ebbbbb5ef3680a2badeaec93d66bcc0b0e5672e6ab779bdc8e23f58f. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/IT3GN1800074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae9c754717bfb28da0db331ca97f663d323cd94be67591932e2743cf5fab9a48. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/IT3GN1800076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e64c66bd2f7427faba9bccc258f6d394c952bd3aab2f19ccec61056dc3563fe. 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/IT3GN1800077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe6c6ed6e0cf849234f18ce56764ae5f7861c1233a18395b31948df54e1d5176. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/IT3GN1800078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24fbf7c0417115f5d07984fd3d87422601a3f5e861bab35d16c7cd356a2ac481. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZNWR2245086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5acfa76bd0613f525794733496d7cb45f93859bc80c1b2482ff59e362408fc22. 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/QT3EZ2488323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56dd1cc1e59e4af7a5a8e7dce908c956e7c6d174b0f38d3f2d7f84f4f9e6b089. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QT3EZ2488324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53c83caeafb3ee3c599c0cd4fab1dbbc9739b75874826cfa5fef5c4336589ad0. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/QT3EZ2488325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x29bb392f8f715791bb08aa9a40e7b2d9ae2ceb66bba3415ac7c5cf12e5e8fb0b. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QT3EZ2488326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9da5223280083aa961bee5de758a96f53429fa4696c36ebf4864751de6af22c4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QT3EZ2488327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0bd32f4b1bccaf69a95551ef273be990c2d09642213b8c9b3d16768369fd1beb. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QT3EZ2488328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4242ec9b2c22572d6b6694eadb7fa92ff9493dfc1b989bc2a609df3a0727bb38. 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/QT3EZ2488329.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7a0a8aca72ea7c3d941b9cad05c49aad78bf9ca79c4628de5b4f105f8dba6e7. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QT3EZ2488331.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7766b92f37feba0c3f39169ef0d2318f7512ce28b7e1c0616bf8fbbc9426292d. 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/IT3GN2200091.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e69d3367e575937a5237f1003d6af8fc7ffcac1644777c7461f4e8318b44ffb. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/IT3GN2200094.