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 0x2ad06d6282314d29325a90bd4cf8a7b78aa25a5b093cb846db4ab347366f75bc. 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/0c2fadac-6aa9-4ab5-b2a0-b0b6e53e5d63.json and https://artists.proofprofile.net/proofs/artist/0c2fadac-6aa9-4ab5-b2a0-b0b6e53e5d63.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 0x41eed668440a32f293852fc319eac533024d413dafe54237ed5d6c0e768f9088. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCJPU2397166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cbc2816c5856e5c9560f815dc1ece097240a64ed14d10a3ca0f54862d0ec134. 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/TCJPV2349085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x462e288a834b9c92c6d2ffe8ae072e6300bbbefd0c362a9a37b67fcf1f946e32. 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/TCJPV2391608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6636b65d53efaca861b970626996c3fbb5fc839289d6032432b73a625c777c. 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/TCJPW2333123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f6636b65d53efaca861b970626996c3fbb5fc839289d6032432b73a625c777c. 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/TCJPW2333123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5c32dab38f7ca2534a5dff7bcfab85e05ee186074aca39ba0c07370cd025190. 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/TCJPX2310656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644cba739ab39ba2b404c68b5968a7a2e2aa73fe96942a50285c475400f9bde3. 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/TCJPZ2418358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x644cba739ab39ba2b404c68b5968a7a2e2aa73fe96942a50285c475400f9bde3. 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/TCJPZ2418358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55bc7e7d7c17ca431919d98b43a8417af60a7a54e57a95731e89b3c90e0c66c3. Chain 2 (Bitcoin): anchored in block 959018 (2026-07-21T14:12:28Z), 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/TCJPA2475472.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe74e176221f27b0c382419028a45cecf7e76959b027e533764f1a07103339fe8. Chain 2 (Bitcoin): anchored in block 958349 (2026-07-17T02:28:59Z), 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/TCJPB2481493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9344e5bc86927b38558ae47fca32c5690b4b31b18c416aab6d7f9debbaba96d3. 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/TCJPC2447227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e76baa4d42e39a2e8c38809f1b00644d392bb993d8d9e7476d1d0d31d042c9. 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/TCJPC2482891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55e76baa4d42e39a2e8c38809f1b00644d392bb993d8d9e7476d1d0d31d042c9. 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/TCJPC2482891.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a9424d6e49bf70abfc7b7d64ef032b1de2ef253844e04e135ff29c7702af44. 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/TCJPD2432354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x37a9424d6e49bf70abfc7b7d64ef032b1de2ef253844e04e135ff29c7702af44. 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/TCJPD2432354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d4afee3db002d504ae39f4357ee5ea43f7c2d92880843cf00d63578029ea32. 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/TCJPD2579315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65d4afee3db002d504ae39f4357ee5ea43f7c2d92880843cf00d63578029ea32. 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/TCJPD2579315.