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 0x42e15a3c4200614b24c5f5b1a7d9901791fc9015b4e770284c8e3651156255ac. 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/f4735f00-7566-4784-8cfd-0b669b6728dd.json and https://artists.proofprofile.net/proofs/artist/f4735f00-7566-4784-8cfd-0b669b6728dd.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 0x721c3a65372a1a74e570957683a25ee0f4a6b2eda1e4d7b92da4ce1ae054dd43. 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/QZGLM2475381.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf60f18105e448006f635e69a01f47c6b985a19064f6a34eaab01757f55834eb3. 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/BCIH82101451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d455f7f083b016722267d4e59c3a51c19593ea5d0bd3e765e0bd955e14a681. Chain 2 (Bitcoin): anchored in block 960300 (2026-07-30T19:42:40Z), 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/US7VG2488233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x485cf8b7444d788423e35eba4da9a26aa4942973cf73638743e8c99a3cf3abb7. 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/ESA112427154.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1da08c37922a79336affea00eb4da60b97136317e2cf2d86638fcd51ad8cb949. 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/QZW9L2322680.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7dbbcbafdac983a4f2833a32e982f6c7e17295c46178d74d3698816d244c628. 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/BCVK92500275.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85d620846d690944fa76d2a776d0377c9e0f50ca20325a4050a4337ca0cc7b67. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/GXBAV2519813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccc4063277d538b65ca204052312d15e85e0c97edabf2982130e3f4e19c66244. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/SGB502535034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x99714dcb0b5ca0d5c9fed7a40db903addc2d139ff7c444f7b72f9ac302268efe. 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/QZW9M2457521.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4438110b33abbe6f6f96007621cc0bfc4911ebbf8739325f534752b5f1953881. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/QZW9K2488886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedeaedc8cbe0faf2b0f0f3bcb7ca4c5b06ee4746060dc359af5bb1c7be4d62e6. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/QZTVM2490824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d8f9cf7a6d737b836acd909f75294e2818ab7359d0f39e0d9cdb287ef6b692. Chain 2 (Bitcoin): anchored in block 960381 (2026-07-31T09:50:11Z), 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/QZTPX2475389.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5be11b421906d389a5606fb33db7a10e8405ba4fb9d67dcaf12aa4b8d0cedf33. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/QZNJY2455076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4f3f247712e6ed320a3f609acdcb67ee4507e061e2fbba06224443c800cb89e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QZNJZ2463845.