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 0x093c7ce2bd1cbe74b835b5d47fcd7301b46ce709288be71001ad854d122ee383. 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/b72bbaec-e83c-41b1-99ff-45b83feae4ae.json and https://artists.proofprofile.net/proofs/artist/b72bbaec-e83c-41b1-99ff-45b83feae4ae.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 0x2eb25a0d8422958a30a338f576c1a142aa4285af15f596d8b761419f12df2919. Chain 2 (Bitcoin): anchored in block 958963 (2026-07-21T04:02:02Z), 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/CAP941598304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe4ca424cb6c65e732ca93bcfc5b0a785c9ce9e928b5518a74d54a061bb29360. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/CAP941201802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x693dc8b5b96bbe82e22645cff61b6fffca149f40fdb3f02109f17f67772eb43d. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/CAP941201804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f6b961c01d41039b7eda665b5f3276ad586e21e7bc52538709d8a142c141008. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/CAP941201809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa742ca9d88abbd6d0c882ee84fd24d0821275ecb1c2c87cba02db4cd13902a. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CAP941201901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda82cd8e44477405738b8ac6e282d93c98b5d28722950fa39d171f9f0a294081. 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/CAP941201903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc1dab6f7836f5cc3f53103283d9e47f970859b27f820f9388e29b37aae9eb37. 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/CAP941201905.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe3f55aeb95ccaf41df83818260ae8cd2222d59b1d296ba9e9850dfc5ce8c9c10. 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/CAP941201909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6cae27af6c5903ed054908cbbd08dbb1d6f347a7ca6313711980ef2acba9d09. 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/CAP941201910.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2892a72c5c29d7cad1d582ee59dccfd32b1cc1a10e01fd856090505324dc4462. Chain 2 (Bitcoin): anchored in block 960314 (2026-07-30T21:00:46Z), 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/CAP941201911.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b8079d2fbfa63691f8f7a74638032fa886d50cff65762c2426153caeedb41bc. 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/CAP941201912.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1176dcb69d371c872c2ed0a38611e68c190db7414e43526cdcc3f90aff4d7bb2. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/CAP941201914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4de298a89cbfe4fd832746e711dd07d47f8b814a5be37321ceee088daf6cec92. 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/CAP941201921.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18ff25aa4e9ecd1bc12f28326113a1efb0711659afce63a9020fe8c77d8ac81. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/CAP941800301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2515ff5dc603790f101534932f4fdfef1a9468f16fdeb98c6dbb7be87ecb6587. 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/CAP941800302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcff46879e2bf245a8bd9b61a42b0e62a407dc3c1cb7cb9aa496dd98b933e8e01. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/CAA0Q1622325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3548aaba16d7b7be6a1767103036494ce1d39326cec70db2bba3edb8aa92100. 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/CAQSY2100063.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c918811c6916c4bb7a10d4cf664946e5a05af18e00c63eada908eb3d5908292. 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/CAA0Q1500007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2cf57a174e33f2dce05c2500cbf7675aed3feaaad65ad8f8aad70f7971cf5bd9. 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/CAA0Q0512814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb82ecf4cbe5b2dac8062b9a55408ce5dea38623c35dfea3ddf2e2c911fa6ac17. 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/CAQSY2100174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x493e2ba9ad7d41a213a5255a69d1b8d87b5975dae7bbb1355491f094717d2c97. 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/CAQSY2100138.