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 0x437c16627e9526d062049f821728698ab0133f603ad2563d260d73b24e9145a4. Chain 2 (Bitcoin): anchored in block 953765 (2026-06-15T08:55:24Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/be9460ad-501e-47ba-9cfa-5962d7582ee8.json and https://artists.proofprofile.net/proofs/artist/be9460ad-501e-47ba-9cfa-5962d7582ee8.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 0xd8121b1e5f1f890e0348b7385f097514f0ca56c8b58a2db6084f9bf661d86969. 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/QZWFM2457511.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xea52937b3325a29abff80be0622a395abe03a033a13d691e88dfcb28dd1950bb. 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/QZWFN2493484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb294cfcf2b762d10802a90c1e79bed9dbe9afd5be57663ad287b238cc1621c9. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZWFM2483411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8769319ddbdef69bd7f303b4b8b365f92df12fa37f782ea80995f39435856dfc. 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/QZWFM2483401.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf028b553c0e703eb4201915a9fe445f6a985a107e9cf20eaa17c70072db9388f. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZWFM2484533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a34d51acb40583c6d033e4b7d8dbd4e9c24ad1f7cf5244c85610e0747feca6. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/QZWFM2483397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf849913f3961f81b1bcbaf2b78a8d07c1a6572139dfbb7594692cba1744c0c0a. 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/QZWFN2467865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d083206b1bfd812e3f5bd1c44c9d120b4e107074c8373b09b131737bc669ea7. 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/QZWFU2427686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc397d0ff3aebc57f4f87b93f52e4e31b0311c1732bed6d2e4dc591649700fb8f. Chain 2 (Bitcoin): anchored in block 958980 (2026-07-21T07:04:12Z), 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/QZWFU2460878.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbed5ff78d104a7fed74f9cc3406912c3ea789bf67461e92488748d84fe46d39f. 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/QZWFU2425763.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74700dad59a4cda3dae9f3a9ee3c25bfce7b0027592f820d427ccfe7a15a1f8c. Chain 2 (Bitcoin): anchored in block 959065 (2026-07-21T22:00:50Z), 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/QZWFU2460608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b912113ccfffe67b4a1d64ea9d3d6791bc2ca8ccb8f5c1356753f7d42d39e0. 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/QT3EY2490136.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e0e5c2a5652dc20b2c29f3fa29eed445b9bf3efaeb09c83b0e2b97677565a56. 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/QT3EY2488405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc81c5f613a5d14820f89d786218a5bc7ec975f9103528a8d4505bd8cc1810cc1. Chain 2 (Bitcoin): anchored in block 958864 (2026-07-20T10:24:04Z), 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/QT3EZ2488640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc6c2b18af4434e4a7306891f488e04d0f9126a5c3fab294601001b1e09459a28. Chain 2 (Bitcoin): anchored in block 958850 (2026-07-20T08:32:30Z), 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/QZK6L2559234.