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 0xf3b31d8a7c674cd72d255420cc7f02c0a2c014dd20f2cd5923a02921daefc840. Chain 2 (Bitcoin): anchored in block 953777 (2026-06-15T11:52:51Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/cdde6de4-55dd-4e74-b280-6eda5f5230c3.json and https://artists.proofprofile.net/proofs/artist/cdde6de4-55dd-4e74-b280-6eda5f5230c3.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 0x5f266922599819f15f28e515149390b21317c1737a855419881d9431bc8c98fa. Chain 2 (Bitcoin): anchored in block 960489 (2026-08-01T00:40:43Z), 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/QZFYX2314188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd457df1945d33e336fabc4d118712705090d63aab3d85c63ecbccb1c8de1db2. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZES72308823.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa82b4495490ca098437358d221f5493590425729333a2592a1aa74c3db5c7fb. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES72308824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb812ecd229b8407f44a4e07f414723e5f7a242f6ad58ae80d7699c9184a4b079. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZES72308825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cccad268bfe0bb548520f44d6d6cbaad116374867ad441d0112fdc3ac27e56. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZRP52236720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36742a74f92666c628a2354d3d5438fa162288363ca0cd40ac2f68e08b811bd8. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/QZDA72392617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6539356e0721eb607acae9530d32821d4a6eb17b3d44b9052905b37940f22af. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZES72308826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1e64d31e3b2061a26fc0a37cdd8d756a340c73d306387435c405ff2d016a562. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZFZ52106068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4e59db219310697fe03c9fc58bc4fcfc9f372677b941a2b8f410bc47484936. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZFZ61914684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59c13e09ca8b225bf2fe9ca93f02649532feb83e66f1b895039f0966428e7a86. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZFZ61914687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1d17cbfd612abf08c227a7e7ff5d041c8d23d6ab51dc0db66d5dae56fdc0b028. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/QZFZ61914688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf905e5c0eb2b49b5f31a240db0f1c3b0aabd255afddd3c429fac7e744a5760b7. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ61914689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa579b1a71838e86a8a8d5c83eeb3f9c48efc24fed414478b6e91045eb3bb24bd. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/USACX2400563.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4de13e7f7304680ccbc1226869198dd763a28ef48f18af67dcd3960860e8f37. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/TCAIP2482059.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cb9bfc451bc300c6831a7d15796ecdaf64c07b1aded404994456e7419f7fa0f. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/QZK6P2408119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39c9a41b8addddc1ac112c1ff13e1c797c524cce2faf43c54fdfdf8ed7cc0ed. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/QZTAX2352680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8aa71195338974088cf357653dd2c10288493de67f8f4bf1ffd8ce16d90ff8cc. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZFZ32419316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa39c9a41b8addddc1ac112c1ff13e1c797c524cce2faf43c54fdfdf8ed7cc0ed. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZTAX2352680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf421ef3338afab690d3eadf3b36ccd371cab5203f49b061add8ddb9d1e11435. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZPLS2347082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d7b25b3add48728153bbc40504552ee946a29b5bf4f8aaed4970ce8bd553663. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZK6P2322244.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36742a74f92666c628a2354d3d5438fa162288363ca0cd40ac2f68e08b811bd8. Chain 2 (Bitcoin): anchored in block 960175 (2026-07-30T00:16:15Z), 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/QZDA72392617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5011356ff637da287eaebc1314989cb2bb3854a7caee7eb522e9d1d1c435f294. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHNC2099681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5756ca3a5b03984608559c2f28ffd66488f655793b625883c923858183d85d74. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/QZFZ71933014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0cce6cc85b40462ae487b0857d53c56d71c0033cf36d4e009a7840c218fc3bc. Chain 2 (Bitcoin): anchored in block 959147 (2026-07-22T15:43:44Z), 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/QZDA61965222.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc3f3de0e1fb9810b8a843d98b1967b65c39404d8f330caecbf5ef33ab98cde1. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/QZES51889211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f0e5f4752d28ad82efab33d6b2fbfe7084f712801a890b8b8648fda88b5115. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAHG2379933.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f266922599819f15f28e515149390b21317c1737a855419881d9431bc8c98fa. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/QZFYX2314188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d5b399598de30336fb6c2d6ab00e4e5149341ef75e857827c87796275f7e48. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZFYZ2006190.