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 0xeafc83dd2e5154306cdb44d3ab9200ff608d0e666e23cb264ccced8af5ac7135. Chain 2 (Bitcoin): anchored in block 953645 (2026-06-14T14:31:42Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/407eb933-4034-41a8-9d3a-096d81004580.json and https://artists.proofprofile.net/proofs/artist/407eb933-4034-41a8-9d3a-096d81004580.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 0xf2f71c649bc564fd35f2f208bfd5baa294b7b65aaebe806dcd3bf056917e2ec6. 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/GBLLT2118108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49af01fc0dc693f0cf235ba4775679e63baa85fc254a30f8e5e8af305ed89739. 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/GBLLT2118109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6dd2cbc809e61f147c192845d525af145eda229277e94814b140d4ad1287aa0. 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/GBLLT2118110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2da110bc50cfa7d759bba95f5a077ce92d8963559fe791e2ad60fd1887775d85. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/GBLLT2118113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4dba27aa7f562f79a41239ceff174cca02014ee52f47539083a269535c9d3068. Chain 2 (Bitcoin): anchored in block 959132 (2026-07-22T13:20:46Z), 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/GBLLT2118115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c502e6b22e85cd2a220b8445ca6f5d7f050bd3db900bd784e15c4d5dd4c06a4. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/GBLLT2118121.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16197473fa1d78a385ba0e16d4de19f367cb508e61d56358036bf6ff62c73bc6. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/GBLLT2125817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc65e6981c1c42848ae4fe8a84e709a5f3ff2ff6000c3796e9161ca961e960df. 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/GBLLT2125818.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7478f8c4c3f350edbccff5424532ea2690c05eb343cda7eef57f3d55494827f. 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/GBLLT2125819.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49f55991564edb6ecaaa4ce5fb4ccd611db4e63a6533f5c7408f58868ef9bb25. Chain 2 (Bitcoin): anchored in block 959152 (2026-07-22T16:23:52Z), 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/GBLLT2125820.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5a1593e3d40b15e7ab9eef74ce36590478adae12e9b40038f037907bc2979c. Chain 2 (Bitcoin): anchored in block 959105 (2026-07-22T06:33:30Z), 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/GBLLT2125821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c313cf3a8f2e0577406f44e1f946a09a5534d11c23508a6ebb91400f4321ad. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/GBLLT2125823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6084c9f6e1a76e7885db51cb518aed362889d72b594202f0ce6b07b81ad38918. 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/GBLLT2125824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93e62850b45cd50acaa50949144718050c4572fe48e146e3ad7ea284b65aaaaa. 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/GBLLT2125825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ec3384dadb80770072a462c9119eb92a8515707d85d8371f68a221abc908d6a. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/GBLLT2130271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x155a90fe837e4887ad6914e9fe94606653bae849afe781c688be6dcd8455a1ca. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/GBLLT2130279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x97b0501cf8210cfed054f700fde4662faf3a62a1ab263c0051a4eb0519141237. 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/GBLLT2130281.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed7ba6b88695eb239630c73a61e0654faf22ee5a140fc56e7f4558db91e52a60. 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/GBLLT2130282.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14c5e0ea2edc16451950263bdb66ab47ae63aa7c046fcb9635dc209f72f80900. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/GBLLT2130284.