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 0xe8e05a62b869042d55affe47f469f49d790f901f38d6df125484410e086585bb. 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/49e9e11f-c1ef-4dbb-858c-96c426e53bf7.json and https://artists.proofprofile.net/proofs/artist/49e9e11f-c1ef-4dbb-858c-96c426e53bf7.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 0xd6f1cfa88f778cfbef3c6e2d29248cb4ec9015668a3fd95d8db22a349a5f96c4. Chain 2 (Bitcoin): anchored in block 958316 (2026-07-16T19:42:29Z), 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/QZNWS2089387.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9070a565281efed5e9b56ce08715a6f6808d8519d55ca991ec4f2fc8d450a2ff. Chain 2 (Bitcoin): anchored in block 958749 (2026-07-19T15:48:23Z), 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/QZPLS2034716.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadc14867e5187350c31474691c4aeb99a4d7890618542c5defdd2e8ba6f86d25. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZFYY2124450.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0279f80835cb033b3287440cf1b83b27387ab9f34b6e8f98889ef95af1eb1c. 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/QZFZ42188415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9acf65741893d6d21d38414b81115f5a4fd0f02bc89c0ad67d35a58866d10ccd. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZHN92129594.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd6d31d945a59e623f3b609237af71f60210bc53c813b9527bbb0716151800bd. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/QZHN92129595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565bf6a9564225de0b2ce2b935835864e9aca8c81b804876de5a843c5e91ca03. 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/QZHN92129596.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1087ab36a3f7844913f11bbe6094084c7bbfa1e3c8845e66ee31c2dd6787264. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZK6N2116168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7646ec78e9924dd38dd7a42ca34213791c07a57dc4b2a3e770027a9cf5b757eb. Chain 2 (Bitcoin): anchored in block 958329 (2026-07-16T21:48:38Z), 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/QZNWX2228929.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de98ed42a3155b3cee00650f9935bd2c985c80410d3e1042eaddd4ca3d4b0bc. Chain 2 (Bitcoin): anchored in block 958905 (2026-07-20T16:14:34Z), 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/QZHN42403180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe488004ad2534c4f0d4a0b59f6cf94e95f92df06329c0da2ec683a2e699c2a15. 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/QZFZ22394221.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x881c3505f3c7ca0537795bf3dcf021abb0616e635966d0449d9641a0c564db57. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZDA52593141.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd29f4cb6f2216c1953b34e2ffe6d732263738ebcab0b8eb40672c8913ee8d365. 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/QZMER2531894.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x413ac69cb8c1a08c5a4fa9e6ac24d5e40d82941dd23582003b6cf0d9128c2fe3. Chain 2 (Bitcoin): anchored in block 957779 (2026-07-13T00:19:08Z), 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/QZTB22574325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b2a9ad50472d6d6f4e253b9b6996fbac42ec89d02953b6fcb507d72e7622ef3. Chain 2 (Bitcoin): anchored in block 958924 (2026-07-20T18:54:07Z), 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/QZTB42566462.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e225796d58fd5b51abfc12cab4b6caf7ad2ab30cd7dafd7564b3474c457ee07. 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/QZWFM2371860.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4f2e9823cd5d4108457f5a46b455396457a4b893364aa9292fefb0cc05640d4. 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/QZNWR2389099.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x565ff29316a365fa0bef1f80b111feeba39057e7b5b1d2ba2a254e56a5a73179. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/QZHN62330835.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20b3b269adf0fdf3241d9cee8dc22a63a55e1ee9a2145101a3ceaa581b636b04. 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/QZDA72316241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f7ca6d7d3b4cb5c3510b8639baab659d321af620e1cb6ffc095e7817da09a28. 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/QZDA82183995.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c55a25641ae7de65862d8bf2b264d2605dfeaa7f2bfbb7b4916211dc38518e2. 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/QZDA82183996.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x984724c6959b8021d1f11ec969df7174072748675354e3c8c4dd6711289b5ad5. 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/QZDA82183997.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x136b12538377baed3555f13d4f15837e232c5552617208f953f7485c0fb0784b. 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/QZDA42186450.