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 0xae70947248b9c08daa79230d3b0ef118cd9f7b60b0fc44b5127f6330261ea425. 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/cd9828c1-3974-4906-a494-2e8c1e8e2a17.json and https://artists.proofprofile.net/proofs/artist/cd9828c1-3974-4906-a494-2e8c1e8e2a17.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 0x1fdbd4c83c4acbc1c2055c1547c9a05edaaa722acbdd082de0f76ca20e9143fa. 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/SKE501200101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1620f340d53deb309ec5d5e97aa692f2f52916750ce620d4d2aac9203e0f638b. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/SKE501200108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94da789b6cd2a7918ec1d734538b218fcfcf94c2fc67dc03e1c7ce0e8e4db90. Chain 2 (Bitcoin): anchored in block 958650 (2026-07-19T03:36:41Z), 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/SKE501300208.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9306fa91d086a647fab7e056f9fe63c2dc7bcb18aad16a580ccb1a5b6608bbac. Chain 2 (Bitcoin): anchored in block 959026 (2026-07-21T15:38:13Z), 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/SKE501300209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f52a030f9de003c2a364c5dc85533cf36ecc5797b378135c0b63e8b625ef20d. 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/SKE501700307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20e81df4aeed4904ba4542e72268cc65f036a6e08fce5ff51b64dadcd2d91caa. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/SKE501600308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96c650f41d61cfcb5049fe8b50e4f60acb089d6d59cc99ec59cdbc3778043b51. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SKE501500309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7b3613b8579a8aa25201bc10bed6ae2e7a4dc732a86c2350db76830c7716b0d3. Chain 2 (Bitcoin): anchored in block 957899 (2026-07-13T19:36:39Z), 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/SKE501800403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3c17b2373d4e0244e30854463d51c9e785befbada1c3fe59ff89cabcf8ff30d0. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/SKE501900404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3e2eac403bee1ab5fa85fbd0c1b70a2d6a17b55e9e5dbbdb7be3a33605068d. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/SKE502000406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x827bcc6e692cd0d05392183874f2a6fe2f0d28f918d7636251a2e47e30899bfd. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/SKE502000408.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8ba671bdb981dddba5aefa06c9e45cc77774ef581817b553b4e287f6a395639b. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/QZHN42047939.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe37e10c69d73b347450fe26d27b219ae61b6af90771c5c001dd55c02b53aa28c. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/SKE502000411.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d3e2eac403bee1ab5fa85fbd0c1b70a2d6a17b55e9e5dbbdb7be3a33605068d. 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/SKE502000406.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb523110a6863c6bfe6494b03fb1601d5a21b996cb0b9782dd16cc82f1e78c43c. Chain 2 (Bitcoin): anchored in block 958468 (2026-07-18T00:27:51Z), 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/SKE501700314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7fe831ee01cd9451874fd8e15efa19ee1946ea3dc334ccca7cba380cfa3ad6. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/SKE502100501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaa286bafde7d33fa5a2a57039b51c1ba3ff3f4f538425143b5faab05b1df0a10. 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/SKE502100502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5f64abf9f56017524912e74c01968b9494a19fedb0719d5ea64e648eeef94b. 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/SKE502200506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d5de8e765a4a77511019df038d3fe2bf325f46ca4fdb3a7c79acbaacc95bb39. Chain 2 (Bitcoin): anchored in block 957891 (2026-07-13T18:21:04Z), 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/SKE502300507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbd26e6238cf122e17fc96e24abf3b29816515c2e3942447326c35dc222e5a9. 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/SKE502300508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63d014b95451c27d102d0b6a840e8268d1d8b41dc1aa6e1927eb4a5636acf5f. Chain 2 (Bitcoin): anchored in block 958647 (2026-07-19T02:36:14Z), 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/SKE502300509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fbd26e6238cf122e17fc96e24abf3b29816515c2e3942447326c35dc222e5a9. 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/SKE502300508.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb63d014b95451c27d102d0b6a840e8268d1d8b41dc1aa6e1927eb4a5636acf5f. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/SKE502300509.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e5f64abf9f56017524912e74c01968b9494a19fedb0719d5ea64e648eeef94b. 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/SKE502200506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcbb118c271a0155424cf0f5ab4304d38405006526c2b457af0f08bc33eb464a2. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/SKE502300513.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10513ad49053e2692c6b5c04b3ce0b726a2975e5231de90eda2235f2dfda3f2. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/SKE502100504.