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 0xe6a0467b5084e0daad0210e0a58391c6091f8bbe4a70b22071aa234cecca1659. Chain 2 (Bitcoin): anchored in block 953922 (2026-06-16T09:36:34Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/1bdaa4d4-b93c-4695-b023-ea674dd623a1.json and https://artists.proofprofile.net/proofs/artist/1bdaa4d4-b93c-4695-b023-ea674dd623a1.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 0x4814545dcbbf6e875444e584620b90f6354782f0e3169e0f21dd57016e952faf. 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/USYBL2101162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c984b654eea7bafd04b176a35392ac5e6a214a8edf54c5312e0d118876468dd. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USYBL2101163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e95d8e1ee2bada147a31f942f87e070da8a794dc28c8c504683ed77602682d7. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/USYBL2101164.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5e819af48a53acb507380e7922d4719a99278992891f180f4da115c5dd29df1. 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/USYBL2101165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeabc7c67e679bf058ce3ae8847a5a07ecba7d5cd1148e9c9fbc01f1e08ee53ac. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/USYBL2101166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a9c22f3cb6fc39a8eab2eb7fa8516bf0befcfb56db6a708b825a831984c719f. 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/USYBL2101173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe4a5ae9c28cd370cc100b20be1d576c0a9a09e7ce029e4c75652f3d721442412. 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/USYBL2000445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77ee50240d7265f69cd3b8995ab5941ef59bd30fcfb5bad2346432046d8f61fd. Chain 2 (Bitcoin): anchored in block 957048 (2026-07-07T14:18:56Z), 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/USYBL2000446.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d45764f516891c2fa632c8b7c3f8ca2635b023fd725c920968aff7f3dc1235. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/USYBL2000453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8aa7d58b3bf9e09b5ac446395d0a139ee239e6a2b101763f54672be23bd3079. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/USYBL2000455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc04a974c389f920e6d37e3d756ea7958ea63bf136e4ef76cd5b54af1d305aeaf. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/USYBL2000456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd30ec3eadaf86bc199fdd66dc05aed790220027ad298aa936a08b7f42ebc488. 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/USYBL2001954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ba9af885c4ec19d847050407040ed3196b51ca09f87a78b3903a8d209438931. 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/USYBL2001957.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefebc43d68be6bcf6c65a01a063f5e991afd9ed66f3d36d1a3345134783bac54. 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/USYBL2001139.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b5d76dfbbd5cb58437d18773accaecaf62e9c22a66ca51f7fc16cd3a827d999. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/USYBL2001142.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3f637a395ce4a76bf8a846e14cb33183b8e3c6df85e9c6ecc46374c88881ca. 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/USYBL1902199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x781acaae9a36154a330e9bc61785d8105410fb81c1c8747f61c02784cd68689d. 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/USYBL1900344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe625088e9d81212213212a4e5711940a5d3aaeb90edc2ece95434f700f76df8. 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/USYBL1900350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6deb16c7d17e74b71d7a4902be7e8d7c5d2892ad4d192575ec03266c61be93e5. 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/USYBL1900549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3edd5cdc8450253dde666c20db0bd69c9a3b49cb775bf1736bca7f04e452945b. 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/USYBL1900587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63e301fbca3100703a2f08fd33dd492f60bfc56dafb77f0dc6b98c97d02073c. 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/US2J72006801.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2c1d6f79701a9acaa12f135abfd694acf81df1720f39e8e43f76d609929f5d. 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/US2J72006802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x552c227d9d85134c243eeebc0e8be46219199c5678d4a9ea4f86a66c6514b455. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/US2J72006803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad00579921c8ca89d465b81d298eda7f84ba360974ef135e519be78a3a8cb3f4. 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/US2J72006804.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcc1c9b677447cc1b842db6594e2ae20f03b5c940a0930744b9174230420807f. 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/US2J72006806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5752e988209d9414d39f8823fe44e577cc03dac91244ef6d76976345cd168ad. 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/US2J72006805.