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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc973fd1f653137940a2f3d9aff9b9f8ef5fc48809d18d3cb71c9f4cd84b0b433. Chain 2 (Bitcoin): anchored in block 953742 (2026-06-15T04:47:56Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/8ea09e64-abb9-44de-ac87-a52a772a64f4.json and https://artists.proofprofile.net/proofs/artist/8ea09e64-abb9-44de-ac87-a52a772a64f4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd485f401c383f038f4e0e2de3ec9131c10d07c659fd23a7696ecfb4602392adc. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZFZ72435403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec9b5b868ddb78f54d8bd89dc26cd2510c4f0ba4e20857df10712ad452b856da. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZFZ72435405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef07891f544b933cb5cd68f7878beae10df8d118401aa47067cc05c6c777c3d0. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/QZFZ72435407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ae22d440e3972e8266db095ca3c0285232942b1b098e5e043c70021d6c0d7a. 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/QZFZ72435408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c580bd2093f58262cef67ada83baefe63f67bad60ca94d087e885793ff3cdd1. 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/QZFZ72435411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52594b7e39cae5fc5c07304687b04a5577c26b403d9a6b2cdd3bcdd38785ab83. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T21:01:02Z), 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/QZFZ72435402.
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 0x57cc5fb8e794baa143e7bfc1ef125177b8f1f55d263bf73d99daa55f3824a63b. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:03:02Z), 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/QZFZ72435409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1e7868a8f1e17736dbcb73767896768930e2d8fa6722316bf20e7d991bf2dc2. 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/QZFZ72435400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d87efb9fbf00cb8b18453f7a3847673915ae34848c0b119b23a98ba1888aa03. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/QZFZ72435401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3661e3e11b32ccd3c4c4faff31e9c54a83c1866a8d0ad9adbb7f6b651c598008. 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/QZFZ72435404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x378f91f076d47f642545b39ab8309fd12365a872bcff2f969e9302965649ed18. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/QZFZ72435410.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d98dc2724f43ac545d3ca7075167565bb2469feadae98d7715daff325b9f307. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/QZFZ72435412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe31f7420b83b96a4b5a53da3ca73350194a6021c32f45ccb1567c94cb3ea3063. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/QZNWW2457284.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52cf85f1744b19a7f9996b45229dd6ded70540ae85b737f66eb1cdc86129d2e3. 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/QZNWW2457285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa31b613aa5ebdb849415141799ee208bc70517729c559b888d376b6f0a15bc50. 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/QZNWW2457286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2754362c2a6eb9b9134799557a33da64a745eae0b69777b4cea74caf9c8c28aa. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZNWW2457287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1cade128ed4bf9b6b2db48e68b1609f9d2f6d9c85a73f546b66609b958c8444. 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/QZNWW2457288.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c568e83003eb564af6b6dc6f5271bbd33463b82f5aa46d6eaeccb9006856444. 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/QZNWW2457289.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa259f8cb700631e919a0e6bd17bd7afe5eecfcd76c22cb692e5a195c78e7578a. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNWW2457293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d6b952bc9fbece8991d92d6e9749d0afaa7fde4846255d49e01a55b5f2413f. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZNWW2457296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf9b891f82c932be47f4d187735e74b891015797f8bb5c24115f0c73245989af6. 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/QZNWW2457297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a2597244892af68ed232fb483818f062de312389ad2d88cd2fab2fad51b0748. Chain 2 (Bitcoin): anchored in block 960302 (2026-07-30T20:09:33Z), 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/QZNWW2457283.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x817ca3889f0fada217f1f486106d35cea4337bdcc0c9ef75d20d7a2a77ea053e. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/QZNWW2457290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79a113a8a10c31ba0b5c84c50d451447f38f67606951a588c1f256484ed57c41. Chain 2 (Bitcoin): anchored in block 960106 (2026-07-29T12:41:21Z), 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/QZNWW2457292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03b7d9bb751f6e65946c078cab04b43c68d8615c59481b1a78b53e49724c620d. 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/QZNWW2457294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7627c23b2a0c65188c1699f5902a1f564e9cd2196cf4379607dbcdae6e0755b7. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZNWW2457295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2eeddfbf5efb303d063214efe686f6592f62a5f7078820f611382870165ef142. Chain 2 (Bitcoin): anchored in block 960379 (2026-07-31T09:25:34Z), 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/QZNWW2457298.