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 0x1d28b1150461e3af99043297b6fc2eb6c23de1c03a8285a1863f8c032e48297a. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/2eb0ddf3-731c-43f8-9548-15b5a5af6ed3.json and https://artists.proofprofile.net/proofs/artist/2eb0ddf3-731c-43f8-9548-15b5a5af6ed3.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 0x47d6404afb3ce6473db857a54bf3a1aa8d99c7eb9effeeb5a7bb9e01f4492ec5. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/BCVPT2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b826950d6f2bf2f58e6228b078a5c531fa5d8fb36968199360b52b03016a74f. 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/BCVPT2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505310d50659981c207e855a10bd8ca26f579dc13135258d3c7619ad1f5dddee. 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/BCVPT2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2864b7475402c4a4548ad081f8f4d9a45caabf2bd0cba81507d44a909723d946. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/BCVPT2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47d6404afb3ce6473db857a54bf3a1aa8d99c7eb9effeeb5a7bb9e01f4492ec5. 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/BCVPT2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b826950d6f2bf2f58e6228b078a5c531fa5d8fb36968199360b52b03016a74f. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BCVPT2400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x505310d50659981c207e855a10bd8ca26f579dc13135258d3c7619ad1f5dddee. 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/BCVPT2400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab02076465a9d58b051bd774a60507c0957372fd7cf9b1b639941c45a319c5ce. 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/BCVPT2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7a6b3373e80b4643ef0ce62fb2b3127a7b591e3bab8aecc149531a43d38c69f0. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/BCVPT2500002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36684ef328c3f3b526dfc9e9553b63d599b463bcdeabd7670d861879ad1a2369. 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/BCVPT2500003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3a28262d60339b88b6679c775058ff0839a14dbbcb91b581c4b0263f88ea827. 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/BCVPT2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb1b77b4c1523af74009520e2ae742b391d928eadb2a8442df878bd38caa72f. 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/BCVPT2500006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2c2ef06433224d84312dfd5b9485fa1e482631b30bea609310f7aee69d4bafe2. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/BKDIV2400002.