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 0x5d71b4cfc431f42243f09a2988cdc2cbae21f4ae816d2b51d772ed1d20e91de6. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/bc0762a0-eb53-4947-b38f-096c56f25935.json and https://artists.proofprofile.net/proofs/artist/bc0762a0-eb53-4947-b38f-096c56f25935.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 0x381ab803af751967bd1be53d8b0e47e76ac058454845e64d7a2d5073ada2976c. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/TWF710600011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e4b01453deda2c3e0755d0b483152077470c2144e2731f6c906a9a7822a5af9. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/HKG732270428.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17d40b4929b59e07a1a41c4e88ec4d78a942f318c89bbab6818e20767ae7a915. 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/HKG732270450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bd7898cedd2cfdb730f170d514516cc98caacc2131e99f1c07973bf8b6f4415. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:47:59Z), 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/HKG732270412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d378f3b2c3c2309aee6fb226cdf3cd368cbb4f077cd40f18c39dd1ffca52a76. 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/TWC430600001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa443ff0fe59937e5dcaed7656e1234259d1b0494ac4ce9bb5a7cc83809d0c860. 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/TWC439900112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x050925d3e6cb5d054d40538a817134a5fbc2e34da9f5786fddadd52c5615ada5. 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/TWA539900262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x794ed46071d1bdd5f436a918fe59e2a65b97af9f6722a527ea2db6f338724881. 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/TWC430600003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fc7fd7d6837b19c8a93ed438c546a95d164a2485df59a8cbc816ec56efdd097. 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/TWC430100001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22eb9c7c183ac97c9ec73069c13166aa1601c389851b985dacd04ef3e248b34f. 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/TWA539371307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6adda565fa21750dcde6b8d0a28fa1c992eb8a6b5fbd405fe7c3fac0c4725079. 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/HKG732270370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69b263f8311f505e2244086026ffa7a8a3f6b171bc6e636d7a696791af8a35b4. 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/HKG732270524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb576de1eb63128fafd29144af6f56abeb8cbfa76ef0eaf5b31d35ca68c0c1a6b. 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/HKG732270348.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacee15d09b37f8faf1a7d56dfd41c482099f05837e6ee870a19208426cebabcb. 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/HKG731679390.