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 0xdca5f4fb9e8f1d547b49b47df8437a1f7f2127dd285477e65ba7c1f4942415c3. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4db42288-0977-4d39-b7ae-40a6b0edc3d0.json and https://artists.proofprofile.net/proofs/artist/4db42288-0977-4d39-b7ae-40a6b0edc3d0.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 0xb905e1b66c12c0bd83183ca55ada82acb70b6bd5317667407e43a5fb1d479565. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QT3F62557278.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5aa2dca30202b08d7acb4ffe4aa8fe987ed5377b272729a8cdb0fe4a67a8082a. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/QT3FE2548705.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb74edd2eba4f86cdb5580d8385789e59b0f24b72b3376c43daaf6df8b15140db. 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/QT3FH2598357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfe9861dcbe7106af71b858800c3986c72a9e9f91d2fcfa30cb002398fc3673. 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/QT3FH2598358.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x071691272dee089f781bbe2001b906d19faa300b5fb399c433b466fd89228b30. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QT3FH2598359.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7e4abf30c533122ed40bd367ef7116703c44abf60ba3223a106dc70b2ce5da. 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/QT3FH2598360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x901528787307adb65563b7bd67a63f699fbcb161bd41e1fa77fe2434dc475ea8. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/QT3FH2598361.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0dd873ae65f29207ccb0cbce3eedba0b74e5c0685c2f7a47e9d3d4b03e4f76b1. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QT3FH2598362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb8520e94dfacc0be615352f65c017b60cbd9601e0cabd462780998954a6279. 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/QT3FH2598363.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae2c105aac0e5c5b3d36983748e599c8b0415e930916e5213d7bcfda8829c29. 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/QT3FH2598364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7314c8d0aefa534c10a2c448f2ea7290f668fcccbf469a9726ddf12bde015379. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3FH2598365.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8f6d38425b5bde9d5a78d0db5559b72080808037f8483cbbab2d1b9396f9e927. 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/QT3FH2598366.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dad0c8daabac2d89514043435a3e718c19b88fb6c0efe13da4f53f83b7a50c8. 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/QT3FH2598367.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb209de6842cfe6531a254422201d5f24697e4ec78f306483c864d86092ecd90b. Chain 2 (Bitcoin): anchored in block 956656 (2026-07-04T14:03:39Z), 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/QT3FH2598368.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcebe4c6c4d92ee2be5a656b72b78bebd05b3f3bf242503e9566ab399cf2cf01f. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/QT3FH2598369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc4765c7577bc367d2375b8f97957b6679d79dc5e8ef0105eb02e18c56b494296. 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/QT3FH2598370.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x39ab7175a977339532a913e3b0af97f5bfbee4b2c892d651431712a50dd51e30. Chain 2 (Bitcoin): anchored in block 958538 (2026-07-18T10:30:13Z), 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/QT3FH2598371.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeecded71ba60a5bd2c67d42ca2498887f5f0f1b5ae06e145518563406fc6f752. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3FH2598372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf560830ee05c1d96fccbc3d8b9f9df1a17be4091ed1bdc0feb4aec9a8f67d3d8. 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/QT3FH2598373.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bf191dfad84f10d96f6e98f08d2d2dbe98787b2348a91994d847171d1503b4. Chain 2 (Bitcoin): anchored in block 958496 (2026-07-18T04:43:53Z), 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/QT3FH2598374.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d9b2e8e415d15f9a08cf9f30a7a4cc84422fd115295b8481660168f5a102e6e. 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/QT3FH2598375.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d832cbdaeafba1f819762cdd062d1bb43920bfa0b7ad1d05264d1dc683d719f. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QT3FH2598376.