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 0x7ff917ddc7562a66389e0e8dea325e7da30841c2b1d756c2d1186731ea208c6a. 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/4c09ba69-b4c7-4c2f-b88a-7f46e807d595.json and https://artists.proofprofile.net/proofs/artist/4c09ba69-b4c7-4c2f-b88a-7f46e807d595.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 0x758fa69ba84998aa1c5412cbd45d7cbcb3117734da78e37f2b9be580e02fb931. Chain 2 (Bitcoin): anchored in block 959034 (2026-07-21T16:34:25Z), 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/ES47E2007680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e554ebfce40f5c15fde8647f9a5a34040f425c26221bf9c8eb3bb7a6c454fcd. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/ES47E2007730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95443d85a97187f60b1ea11e9f5832e64451260575e6ff5babcadd274103c863. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/ES47E2008929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4b0b6c788f6a7226b78610be645e381c20a80862131f896b65c5690b120fc135. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/ES75E2203887.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4ce6cf4e93f6897c07e77eb4d8d6dfbb73974eb118715d6db295132e5c2893. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/ES75E2203461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eb509ab85017e18eae03feab4fdceb7e1640c2c641ea36c3219f3eab917f81f. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/ES75E2203462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x789cd4252144ee17a5e836db10b6ba19913550202865a1b2758a234489166516. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/ARHXW2202599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc75a68d6462d9bd058b6a15a4b1a0aa780e477588b9269827a5767d7b370496b. Chain 2 (Bitcoin): anchored in block 958853 (2026-07-20T09:11:53Z), 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/QZW9M2327034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe9a479f08e8194e28c057a6075de7ccb5f395f43a8f009d5a60770ecf9e0a219. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZW9M2326969.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d58f24c2b8f686bde5ebcb1263c351d78c857fddf461a66600b51caf7ed4e1e. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZW9M2326907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17007e7a0957c79adec76fd561fbf1409f1bd121ed51038b79084cb3204ddd47. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T06:27:23Z), 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/QZW9M2320140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7cce4b75cab310f09dabee2e62bfbef969b57cee9073cebf020e17deea3ff010. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QZW9M2320207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8aa63d524db9bc1edc1d4964a5a40cb340c9b713b9e4dcc43db053f6cdfe314. Chain 2 (Bitcoin): anchored in block 958736 (2026-07-19T13:04:09Z), 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/QZW9M2320177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f47ba8001b548f5674908c62f9600a5935914b112a3132eb945a87ccf667c87. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QZW9M2320281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9dadfc735bb2a471d57e00dbea846279347e8f473b6ea790cd8a4868681c966e. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZW9M2320261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bffdd1ab00dd9673f6fa2b39eb81bffbed481fd6b9ba4174f349e1ff36f9aca. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QZW9M2309592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e62473e2eee20cb06b7a5d0c35e8b95de5bba326ae0a7264052b9c5e10c96c. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/QZW9M2320303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf07538c84e6f7f30ca7d95265236b1c0721b7dfe53431ad313f88c1d42196455. Chain 2 (Bitcoin): anchored in block 958563 (2026-07-18T14:29:03Z), 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/QZGLS2441817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d88b96b45cc6af6262c5ce85c03b63848a869422c0a1bd6b4121e143f6a74dd. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/QZMZ92422244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee5a7e40bf5dffc3a5a8fac54a74714ce30eaf7cf867ae20d252d6f357cf11b. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/QZW9K2431073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577a3123a9025e0c7e5d9656a714294fb7b5980f58a7fa513c5de4461e64960b. Chain 2 (Bitcoin): anchored in block 958838 (2026-07-20T07:01:21Z), 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/QZW9L2406285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d91c53796efbe494f2ecd959e9da67bd34583d631f765ef0f8ca70f1ae3e39. 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/QZWDD2261004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42ba49df31946217f7c6e35cde35ed606b8537543e5892907bbd12a0b17b6907. Chain 2 (Bitcoin): anchored in block 957039 (2026-07-07T12:58:18Z), 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/QZWDD2262483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea0e230a84f982970bbd38aeafa0da7abc01d3258d3b2f65a9281d03f93ac59a. 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/QZWDD2257211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43ed4696be2946cbf9c9b3c38821aad4a3cbec32a85067e796c6452a1f0409b5. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/QZWDD2262577.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd63ae30d290dd4a20740ecb6b34c8d4ecf90b92d024eab21b87272e5f72d2124. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZWDD2262583.