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 0x485cc874383d2a3cb2530bec9feb5fe77958d2747f7d45e80fc038c4d0af5222. 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/43d92daa-11a4-4432-889c-e6a04d47ab8f.json and https://artists.proofprofile.net/proofs/artist/43d92daa-11a4-4432-889c-e6a04d47ab8f.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 0xa40989d49158359025615c6b36ff3c1ba85a867a565884c62c1304b072e64fa5. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZNWV2383411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc476f1ae707c3507024687f6f484a1c03a8ff0dd81b7439f81f3b95eb896d611. Chain 2 (Bitcoin): anchored in block 958770 (2026-07-19T19:26:13Z), 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/QZNWV2383412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdeab29bb6c9fafb3840a73cdf007d8e0da7168a601751d66cd8ca2af795c530b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/QZNWW2337891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x134db5fe6454f8267b8063eab454d986becffef583201ee4f68dbbf5777a6acc. 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/QZNWW2340302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f03801dfab66e09abbccb349273ffeff94dc5b5f7117f4dea6cf07cb2cd6051. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZNWW2312866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1603cd81c60372aac61696ac92a6ca9ef5b756f82c0898598e258c5df85fac52. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZNWW2312125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf86e542a3ed9e73c80a41665c0443d5fe8be09b3510bdd85b0e6e013244f709. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZNWW2340549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaba056031ff8429a85149306b91b6fb85fc279c005eb5b8a5f62462ce3b0fd48. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/QZNWW2340595.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12530cc43bfd07b77e1addc14c6813a5ae0c095aded7b9460f04cafd062f7f00. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/QZNWW2312868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x432c891423856d3ae4b0c72e345f28a2090aed6314c5b3749234469c20b1c5e8. 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/QZNWZ2369471.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x843b9e45d6c503ea7934403fa52f1fcc1902d53de7a1103478994d805e649299. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/QZTAU2377568.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe91e585aaed69051de3231c122a405574d853877647993612a9c317a4696345d. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTB22395383.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c4464e930a01ad0fad5989f354b10491d98d6093eaffc4e9961b83197ebf6b0. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZTB32305714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x23573b44a0eb76a1ad9d34dc7b5442b9c70e1524bfddde84ebc6b0d7129c6d12. Chain 2 (Bitcoin): anchored in block 958775 (2026-07-19T20:13:58Z), 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/QZTB32362361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7814289cc97e1ed3f1aaab9da5172caff4850e84a75096eedb8a231a79bae62. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/QZTB42314372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde8629ade6d816823cb5fdb0ff06bcbaa0f833ae89b9ea4c08af941d3d8afece. 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/QZWFN2306769.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39d16435e9cb7a8977c75fb5890ea2cf7e6ea78a6d99ee701e86d6708f753aae. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZWFN2336946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77885695809c1de9214dc217fd42cef7b1176646c9ae7073889b193ad0ba8024. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZDA62421664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78b732f1c81c229dfb952c90a96d91dbf3f0138f61f9fa6e65edbcd842457882. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZDA72448058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21c89e97e300c3858347028d5f88edbbf707e4f22fa5bfa024c9c9a6321dd219. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/QZFZ22566832.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcbaaaa5a50f8e24667300cca0944bbec6d44914fccd98e965c0d0967025b7b6. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZFZ72546865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef710d1c8efb45e61c8383fc1a7e4c71d9c63cfe85864a3051b34f6b17fcd7f6. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QZFZ72546866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a79ed76e5702e5605789e4699e0670dc73ef0917317d76b8454fda207dc15f. 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/QZFZ72546867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf295d4807a3dc66b88ebde880382acc776a7251cf0e0144ff305c623c6b667c6. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QZFZ72546868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb68294056e86d0cc695b46fd22f628237d7e395c93f460bb1f945b1eb8aabcc4. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QZFZ72546869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c440cb3338c1d8f0689a529617f5ec05bab0b82c2874c14f1ccf8aa5d8f8c7. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/QZFZ72546870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bfcb58f0e425248ef716592f3e382c4ffe547d0563bb68def5f7a1e853bf48c. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/QZFZ72546871.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f8828d08eba373e4c41c1fd9852c27afab273ede18d324e2c2f92b7b810a6b. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/QZHN42515344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c5b48a5c2975037a65d7444be4ddeeb88ad976f6243ab98123d9b89b74c53c. Chain 2 (Bitcoin): anchored in block 958602 (2026-07-18T19:28:16Z), 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/QZNWW2314725.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x890dfdc30a7815aae3a12b8f7d966524d56224dda953ae8b0f22844ae59c3df1. 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/QZHN72527531.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7af90bff88a45970a8e5cf0500c90f457cc93eaf5c15c0d5d2f0b7a6e7069327. Chain 2 (Bitcoin): anchored in block 959091 (2026-07-22T02:33:54Z), 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/QZHN72527552.