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 0x0a2ba3c2cf4809a554bf17fb27f97e342027fdec8ec1b3e8deb630ea2c72f3ec. 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/1c5fb775-0fe1-47ce-9c8b-c9f8dfc58906.json and https://artists.proofprofile.net/proofs/artist/1c5fb775-0fe1-47ce-9c8b-c9f8dfc58906.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 0x9ea70d12f4a5f02ac9c5ae75f368a1ca7c3bb23571c3790700ba71d6adbc3610. 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/HKG731610427.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ca47cc5c1ea3f58362a0529492a5a71be27cb91241b23ffd9dc22bf54b48ffd. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/HKG732327152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15e7aab6a2b12bae25c1bcd7d6ab52d5e47666bb6e84432a8f87b7da0202bdd2. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732327153.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc1e45cd9e02a9d742159794d601c579fae134d9d4b58e8d5b1fe1dc9b2d14e0. 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/FRX452115764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2d58776746dffa8dd77f6d946901bde2d166e8782d00944497e90f4f6ce8d74. 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/HKG732423247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73850ef1dcbc207a34e5b89329c7a8223620f425b4c20a654ef24ec66ac95124. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/HKG731677025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8ce19cfc73e6ba44c41fd1bd07a72a3db820cb40ea92540fdf56f925e506882. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/HKG732375549.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfecbb5a0b4ee3306264193e2ba9c87326a2b998660c4f02ea9a5a2264a7da660. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/HKG732311569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x495510a3592d67ab144f30da5bd2cbd541b68a9593af31ae9f758d953d300219. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/HKG732276926.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dce6a855c2109bc3951121d50f9e3213a40905b295abd4aa1ac44be2e2fb9a7. 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/TWDL72203236.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ad563fdc07935e1c351856a2808cfaff2a0e83a8b2598f3392732e970674a02. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/HKG732314550.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fc7a1b05a8917d0c1e71ea5f103e581ee1d4f6afb8076891f07aa106b7213da. 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/FRX282171030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x985532473b87565280fcdcfdb9465df97be16931cf2dab0cb85414ac85c8ac2d. 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/DGA062077789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f5e67c2de9bceb19647b6d71286e92f08f8784eb47efeae9ded6b38d3cde3ed. 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/FRX282004140.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd9ab94f196cd36a2707f5bef80df3d8e5ed411023d8e3a73d46a98caa092a3c5. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/FRX202043198.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc921596a589e3bbcd2e23145a25c2678277ca88a786df6e8dcb38f87041c6dcc. 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/FR59R2002719.