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 0x868ca197c0ca6a6b22f468bc8cddcc5fb0b64b0b60cfddfd2895b35bde477727. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/5cde9246-1c5b-4da8-bafc-72c2ebcc3855.json and https://artists.proofprofile.net/proofs/artist/5cde9246-1c5b-4da8-bafc-72c2ebcc3855.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 0x79d2202c3cabf37f0c780c178bb30f805480c41421c625253558185e46d1902b. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:57:38Z), 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/QZQAY2136345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cffc63336e3a064e17014c52be860d0c5cbe5e105c346fa1d533f8c9f45d9bf. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/QZQAY2196603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ee4222e7d1a48588c084a7b8edbc2e818c33fb6a13fa61d8f16ce64b47b0d12. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/QZQAY2106926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa73440d39f0396f796e706602074338320cfc09570524ff6ee66ad1a3df7d08f. 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/QZQAY2197199.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ce2b97100c04e1fab8797cfa713b603389e38d77085737c8fe27504cbf03873. 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/QZQAY2104119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4d9ccdb75621c05bd56b4551ec97bf4e48087b10b61e5d51cf396b15ba6d085. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZQAY2156318.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4d34d7e9db2094ba1a48f9dcea25b4fec1660549bcec2df2118b8faef6a76f1. 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/QZQAY2105195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5688286461c9998fafd95b98fef7ae9c5af2d22eb6b20b82e54f35600403dda7. 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/QZQAY2168007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x588d8a7de91ba4392c1e3260df09a3eabe77519f8642ddf01ef0443178347915. 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/QZQAY2154479.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x746effe919e0b50cb1ede355e61895340567142ba8b9f9f074ce1448c2c68ff6. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/QZQAY2186211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x471f7d870f4cc44313aa090077de01e585e0248c8a30f18afcfe8b238da8565c. 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/COA7W2391013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bc4d8531497d6efb5808cee0ce5f376a1e211e561e33dbd0eb31d6acf82c5cb. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/COA7W2320001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe77d4aaedf2aa6fb340f645ae216b7e319526c51ee8d534e5512234edde8b22c. 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/COA7W2391047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07505ecc4d520474ded285ec03e7f74ad4f0fe54dbc24af3845cf1bdcfde1473. 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/COA7W2320002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c87b47cd2db9d103191c842ae1f123db1b4aab64ebba269798b1e26cc24067f. 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/QM54E1500167.