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 0xd6f804d4a8c5f3672f398bd47989040fbce3ceab14c02985aa5d1308317db2f4. Chain 2 (Bitcoin): anchored in block 953408 (2026-06-12T19:28:13Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4adff5d8-ab43-4f4d-bb70-0cc1a1c0b225.json and https://artists.proofprofile.net/proofs/artist/4adff5d8-ab43-4f4d-bb70-0cc1a1c0b225.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 0x9792a7b352f64b23a6dfaf1e55cb090033fa52f4b3d2a7a6d856f2d5f2fd3dd4. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAHX2449043.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78d420da3a50ca8ef4771ec8d09021c6b7735712f2adb16ce8758b64f2d365a2. 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/TCAHX2449069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2fdb5b2cf7da2d601ac828de0fb2875b506bb70b9a5d6a0b97f1490695974ba. 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/TCAHX2449076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc2a582a06d2c7172a1fadcb76ba7a981968ec55450bfd4a0b70f60064959cb. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/TCAHX2449093.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61ca149e781c618152c6713c13aca85b1a2b27cd0911ceea38640499045ad660. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/TCAHY2430458.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f535e0fa8cbdd61a5fefb1c825c733533bd27c9cd1fe835c0e9fe88b7cbcdf7. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/TCAHY2474150.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b424bd42ac9bdca4f08e73a04b2fc0e1ba145c97417fbc58e6e3ffcfdd14467. Chain 2 (Bitcoin): anchored in block 958086 (2026-07-15T02:55:47Z), 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/TCAHY2473852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe929c18b534ee9b788a55dfdc0ce44f2e9a697286e1487c5b6069728f27c977e. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TCAHY2473909.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xffcf9778cd7871b6a457498c7c123ea83aec4622f21e55067400124c64f0552c. 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/TCAHY2490807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02fdf17674066c89f08742e9eea30126206fd20777b3ce62424a87678474b951. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/TCAIA2461306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04a8a4f699a56e10a947e06ca14ed28f4b66d52d165690aa13539c51f8a12616. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/TCAIA2461334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe05f96978fec3c7f4e70c93c8a0b77816658c4d51a78fa49e4a5ae66c3f14ad1. Chain 2 (Bitcoin): anchored in block 956578 (2026-07-04T02:23:20Z), 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/TCAIA2462632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a32c3b4ce521e829e09a3ee61572b0aee67b157576af7bd3172598e97060ce9. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/TCAIA2462634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52808ffc1627469f0c2abfbcaa433c39429ac1d06d0cfc27a2ddfe87aba9c940. Chain 2 (Bitcoin): anchored in block 957766 (2026-07-12T22:25:04Z), 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/TCAIA2462641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa30c6e4d3dde159270ab7ed570bd349fe2e587c772d2fa90aeca5c13135de588. 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/TCAIA2462645.