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 0x6dd27f397f36ee4bea9782983c7ddd81efeeb6fc3d39617f825640b29680673d. Chain 2 (Bitcoin): anchored in block 953778 (2026-06-15T11:57:35Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cb6f008a-e997-4d0f-9cdf-61be4912561b.json and https://artists.proofprofile.net/proofs/artist/cb6f008a-e997-4d0f-9cdf-61be4912561b.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 0xe9eccb64ddccc3dea6b53befb34daf27ea607089d17a9d1b9c2e24dd6107cfb5. 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/QZWV32453415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff65f7d03be9179efc816ae53cbd6d3a1c1c464ff91a28ba9817cabe9ae6efd1. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZS672190183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28cb49fdd0d0c5709ca9dda789ffc631c245b5ae2a2a91260961cc5088e08ab2. 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/QZS652109126.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ea1b1754fb9c226bbf1a43fd2818fea6981a7bf3e724972bc6467ccfcbc040e. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZS672251304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf59a026cf3d7e174d1047656b0337757c07614d58724ed07ba49a11fa167f0f9. 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/QZMHL2286187.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6da17f99a7b02c4ae825a0fba9d9a1852ee65bf5760056d69b2af32d3c639ec7. 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/QZYD92300551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea5705cb2cf67310bbe692d34fb0ea80a7f7f66679c9c1de45145d84e7cdd06. 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/QZHN72520257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x11498241dd718527954465575d136201d5abd4e0211705c3b3e7b412c9dc6a9f. 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/QZWV32520533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9477378240e960d399878d0887bebd4d81bf2eb8f0500c419f2e595dcea412c1. 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/QZWV32520539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99b98b2961124ff7d53045f5cbcc7526ea4fe45286a64de7fc9fe6203ebeb14f. 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/QZWV32520547.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a7b5fc11813d104abbc15e138e557bd8c67f3691707abfe5365eeb252cd81a. 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/QZWV32520549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda74c97d1bb8158e896376433f5b3e77a1c784ebb4f85c6f0d7ddf8238718f4f. 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/QZWV32520556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe25b30ec6d8adbf269e5d6bd18d190d7f1b3db5c59a2546396f6dadbe4f53472. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/QZWFU2409604.