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 0xb7f79f484fa7af410f39feb68a8031df70b00e664ba487e0011cd40f10ca8637. 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/882481ce-eec5-439c-931d-fd6782ceb56d.json and https://artists.proofprofile.net/proofs/artist/882481ce-eec5-439c-931d-fd6782ceb56d.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 0xea91c0ef2c337cdd769417710f879f787da2ef28f1d7993f430d34b592ddb1ba. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/MXF149600231.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfda8b19fd53a5f80de5718c587eaaf18d233d8d4f36ecc4c23535de02d8d51d1. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/MXF149600234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xefac67df30e2411de51a39794446eff9f95266ed8042cfd9db8e917f443ff295. 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/MXF149600239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x759872614305d8d2e9d1b5c80497c9164eae2d56a264c5612dfdba8b0093ba07. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/MXF149600241.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x21231b7f79216aa2cd49910a9ded96bdde5c3f74a2fb4d146c4273c699e1d157. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM6DC1661712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ff0422d4bcd53885c3f7399da6577a556b2122962922882c23cc6be8337674. 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/QM6DC1661720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2f76ac730a7575a65c66ba4bc959d03b79c63848e16ce6d61d2c60e64583226. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/QM6P42330598.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82894413b7adcc4148dc6bb2f259663e7b99f00f0acde7ec73977e01941003b2. 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/TCAIT2442054.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38841fb604cf3a869ed523a2e2ab0f7ac2d46e78528e993421bf462e95c462c5. 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/TCAIT2455802.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc98aa4c50e83d5be7484da2f55a82a2b9487bce5f0b5d4d992e2f0d8f45502e2. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/TCAIT2455883.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbbbe11b66e0117e4d81406248d139aab37394c3dce3dc4882bf4c8973eb9eb46. 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/TCAJA2407717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6fe8a4cc015388185a4a396bbd24e954c9bb5b5db0229a793e808a6b1e7945d. Chain 2 (Bitcoin): anchored in block 957569 (2026-07-11T12:44:25Z), 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/TCAJA2407747.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0c9f126c6ce75b6b69c8eb27d5f74a34680f09281581a1a91cd990c161fea39. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/TCAJB2407752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16ecc4420fbed7ab61b81c2c5c506b5a90bc970c89e29e3996fad6cc47e45839. Chain 2 (Bitcoin): anchored in block 957564 (2026-07-11T12:19:47Z), 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/TCAJA2407778.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x628ecc2fd1312c5f5a62dd5433aab1cb07de331344614e982b0b62bd01b6e89f. 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/QZMEV2515411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e2a3e254b877dad67227c69eab6407593738f2fa8badbb5285edc5b42b5161b. 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/QZMEV2515412.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef294daea4ffdef2ebe60a814ba1319c4f26d0706fbc85ec1965ff9bcedae9a1. 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/QZMEV2515414.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdcfd4e12a5c3960371030d52182e0744ac7f8a9d3bdc91ebdb956e1ec178df40. 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/QZMEV2515415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8fb927cdbd6766a86e4a4d638239f84892581ddd25677c48aff50d067c434316. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/QZMEV2515416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc089665f0d03e32991b9fd5d113f45781a2db1180d765696ad3cbf3714b2b2ea. Chain 2 (Bitcoin): anchored in block 958535 (2026-07-18T09:42:49Z), 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/QZMEV2515417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38c4cb8ddaa9e892811fa9102026bca03fde9caa52360882594d8aaa4f314918. Chain 2 (Bitcoin): anchored in block 958377 (2026-07-17T06:48:00Z), 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/QZMEV2515418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8424a8cc6758a29f527a9c117e27446dba6492f731154fee1ac86a705e488b1. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZMEV2515419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87cb3c268c264bcdd38fd05be098146e8c4cef9ff4437369362622275bb78789. 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/QZMEV2515423.