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 0x039b15da5cf63f79f8be438e85f5c6ceeca150ce2c351d9bc63932e6817a64d9. Chain 2 (Bitcoin): anchored in block 953626 (2026-06-14T11:41:45Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/23bd6550-52ff-4bf8-9a1c-edd49ba73d32.json and https://artists.proofprofile.net/proofs/artist/23bd6550-52ff-4bf8-9a1c-edd49ba73d32.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 0xbe4ca0857a9d5c955702ead105b6bc9fcd5ffed8ef421556ccca68ca0812f07d. 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/USCGJ2426730.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ddc108831bf80e80a015819113b979e7e043248f0eee029c06cfafadb885916. 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/USDY42445846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27d87110cf038604761c3a58df804329c0be0af6a078661b518df53eb710e89b. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USHM22466727.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63bfcf48afab3c1ce4498195e05d847b91fbd5c66c687df7b0e1d341e57a138a. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/USHM92427296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x553006c545a1f7b9881f39845e6b08728b11b7c4324336a9d440469586d63502. 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/USHM92427298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5138c709d3159d177c6a2030a64d71f9635bec7945238440362f57aa33fc88f6. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/USX9P2431501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa102d20d4cf9f88fa8bbb68fb8fb325113c86314f40e2a9c7632b33342ac7b17. 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/USX9P2408696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490a7b62973eacf9a10aacca3e4da7e634400c6b69dfd28be7948e4e3f8bd6a3. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/USCGH2589037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x577124f54cd32339d6ff799cd46de95f49a2200467b3662b7a9155f00ad11a88. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USCGH2589038.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3128225e7b4884382c442a354ddb40f3929a61a2357cf23516902a23d3692e6. Chain 2 (Bitcoin): anchored in block 958568 (2026-07-18T15:23:47Z), 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/USCGH2589039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5984ece21f29f8f71cdfd47bf4e9c5539645225e4dca521db18967b6f8738521. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/USCGH2589041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac5d0a3982088cc97c57399a74df3fee51b0f570fd70dbbc2db73b6e14e06c60. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/USCGH2589042.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3574383b6b807efc507098a8f3d36e2c7479e97b138fc2a05ca7444280c5bc49. Chain 2 (Bitcoin): anchored in block 958897 (2026-07-20T14:57:46Z), 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/USCGH2589043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x788f5c7179224751e3a27b3f8569c08ae8ba5690b987f86b5c2219d11f04bd40. Chain 2 (Bitcoin): anchored in block 958783 (2026-07-19T21:20:45Z), 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/USCGH2589044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x044b357b66af0c065909c1ecc81cad080de478cac026584677b164ab90be451e. 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/USCGH2589045.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bcc4739099a08608d0f7900b467e8c95e26c6f05226d00bd59b4553256e4e32. 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/USCGH2589046.