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 0xac8c073a76460f3b984c2fae6b518d8631d286e3c624a0c29f9e3325f9a40d70. Chain 2 (Bitcoin): anchored in block 953699 (2026-06-14T22:00:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5e0955a6-6f30-4bc8-873f-8786ff377997.json and https://artists.proofprofile.net/proofs/artist/5e0955a6-6f30-4bc8-873f-8786ff377997.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 0x4bcdd4ec5ac8ce09699b48a8db11ccb821fd561c0ae78cdf2238040b60874c9f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/QZHZ62196673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ba733cb191284b15c3089a9b7d968db7a5f52826d0d1d07f62d99f66dd4f66. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZHZ62196674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5729a9f3eeac247d695d976a7b5e4c36ad2b106d5e9d263892c5ee31c0f18505. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/QZHZ62196676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcdd4ec5ac8ce09699b48a8db11ccb821fd561c0ae78cdf2238040b60874c9f. 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/QZHZ62196673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ba733cb191284b15c3089a9b7d968db7a5f52826d0d1d07f62d99f66dd4f66. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZHZ62196674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5729a9f3eeac247d695d976a7b5e4c36ad2b106d5e9d263892c5ee31c0f18505. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZHZ62196676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bcdd4ec5ac8ce09699b48a8db11ccb821fd561c0ae78cdf2238040b60874c9f. 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/QZHZ62196673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0ba733cb191284b15c3089a9b7d968db7a5f52826d0d1d07f62d99f66dd4f66. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZHZ62196674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da94e6a1c61658bfde794eed36cc1d8d6525179ca9bada6f17664805b2e2377. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QZHZ62196675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97f33be2652e36b816b32fa53dcf81929db9eafe3d2151d6d2dc2de2c0cf474. 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/QZW9K2200498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272dff75b4b3ee3f9b952446ccfa9e886da6eb992a81c9754b4162cc81705a4d. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/QZW9K2200500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf97f33be2652e36b816b32fa53dcf81929db9eafe3d2151d6d2dc2de2c0cf474. 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/QZW9K2200498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272dff75b4b3ee3f9b952446ccfa9e886da6eb992a81c9754b4162cc81705a4d. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZW9K2200500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbb4f31e7e34ce9c7a0a2c59142fd3c608e3760a4c97736a2d4d55990563030. Chain 2 (Bitcoin): anchored in block 958823 (2026-07-20T04:29:18Z), 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/QZW9K2329357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbb4f31e7e34ce9c7a0a2c59142fd3c608e3760a4c97736a2d4d55990563030. 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/QZW9K2329357.