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 0x474ae47c38e5fd5bb6136f0ef1e63b62fbf3d217a2b5ab022704d6188c755245. Chain 2 (Bitcoin): anchored in block 953592 (2026-06-14T05:36:59Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/06cb3ce5-2b7d-4b62-b155-df6f6efa1028.json and https://artists.proofprofile.net/proofs/artist/06cb3ce5-2b7d-4b62-b155-df6f6efa1028.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 0x0ac10b4726e75d37543b1dd42cada8f9796d09219ebe830d86ceae8b98cbb2bd. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/QZZ7K2404322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ac10b4726e75d37543b1dd42cada8f9796d09219ebe830d86ceae8b98cbb2bd. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/QZZ7K2404322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce6fcfde5cef870de4cad6925ecd2f45e27fa78fc26cc409ed4f2b455b0e5f41. 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/QZZ7T2413739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc06a1e180350cdfb0e49df7c958a163172901382a91b3f8de43c8397fed14e18. Chain 2 (Bitcoin): anchored in block 957754 (2026-07-12T21:26:22Z), 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/QZES72552837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x951443f6c8f2ffed631d2fa6b20dff8b4c1c7c1b39482dc1f040b6cdf73c0fac. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/QZES72552838.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f218fc0d5209daf445a9015c46f4967fff0f4caa16ebd10d9d3c9f4b48b650a. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/QZES72552841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdc6a4cda2504796bbb1d136808324c307a333a8bdbd033fcf2def708c171a68. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZES72552847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x661b64c53772d56c26de9f36ef4ab22c40ac6a08d9a45259c4992a5057479ee3. Chain 2 (Bitcoin): anchored in block 958095 (2026-07-15T04:30:08Z), 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/QZK6K2556913.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b2a129c714c882cf094873ad2165a733e75b966e788b589f7dca5a906967592. 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/QZK6K2556914.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd55374f0c0d5350e33a1fa324dc128c086a52fdcc12c879580b94699664aa691. Chain 2 (Bitcoin): anchored in block 957774 (2026-07-12T23:51:20Z), 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/QZNWQ2506344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd23e33b06e317a461b03047c7dee2d3fc212d0f811fd7cb98aa3ddc030ba1687. Chain 2 (Bitcoin): anchored in block 958392 (2026-07-17T09:46:31Z), 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/QZNWQ2506346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27a9c9d63fe9e36f5ec4683b1a9b1cefd3e71afea3756bc33a6dd1fcb9a4dbfb. Chain 2 (Bitcoin): anchored in block 958544 (2026-07-18T12:14:37Z), 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/QZNWQ2506347.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce085a0d3cdd1110835c6edfea7831d94fc5e009646304aaf1d1f5914562df00. 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/QZNWQ2506348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc686d734fbb4b3301191245d54274b6bcf835b2038cf7fed589ca0d59ebe60a6. Chain 2 (Bitcoin): anchored in block 958380 (2026-07-17T07:07:02Z), 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/QZNWQ2506349.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93ae74a58b5def2409e43975bf381220a4582ef85d12fb1dc2f3682b72303b73. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QZNWQ2506350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbde701101b71cbe9fb8db254944c8adb4691e8d9fa7d8f6e4a74a34f9f106dd. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/QZTB32555959.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25032a537f9ac705b119674d88d2e024761d0014e3952339fcdf08c883de7211. 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/QT3F22510076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4519bcd851cbe85d03d2264d23fdec2de85e2fcc142d74b69f49fc9bad36c948. 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/QT3FF2517266.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5521e134f9a0e34c465e247154f1c2e48ccdd6ce7c1d18bd6530fcb83e83fc56. 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/QT3FH2530608.