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 0x489bdd17df5f736a9256243dfebcbb73cbf37c79f80e24981767aa8e211a77eb. 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/9688c642-4001-4300-bd79-acc7f3bf477a.json and https://artists.proofprofile.net/proofs/artist/9688c642-4001-4300-bd79-acc7f3bf477a.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 0xdca1e3a200ff22222ffc7788a0cf08125fbfabd263a724bab1344986a131fdca. Chain 2 (Bitcoin): anchored in block 957761 (2026-07-12T21:55:15Z), 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/QZMEV2170028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc1029499e76eb4da41b9e9ef02d4f2b79f6e2b85a628be4362d6a0dba3c5f65f. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/QZJG52244301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x930fefda5dc5c69a9913a02b83a01a1a50015bfa42aae913fe36a23ea557dc97. 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/QZK6M2212380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2fcb10b3b19e898125c98704bf3aa8ff127cc6d8d600f9870fbab0312c2ce707. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZNMV2228836.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa7252ac3b8613d144e07b3601dd434f1cb7710094fe2c77bb7406843f54da1a0. 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/QZNMV2290824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e90ae4601e897b4d279b4ae8190ca2992bdf1774bb951ce593c643b46a28218. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/QZDA62369362.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x735a474f25b87135a7ca40b19a2e33ba6feaffad98af34030220e87b51973875. 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/QZES92395533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ac1e2c8a711f02e103d247d250638c89b8e34350b13bba6cc7196b9c06a6cf6. 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/QZK6H2326588.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdec62a5e6e49b8dc4e0939f978f8b622cd75a1b46bd4ef6fe9045c4a470436e2. Chain 2 (Bitcoin): anchored in block 958792 (2026-07-19T22:55:52Z), 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/QZTAY2327456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24f6ecb1d9eb587939d0a7179d1672256c689e96094257731627daef832aaf5d. 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/QZK6P2471551.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeba3fb780b3f11bdbd5abe85441773a5f36854c0d3b516aaca52a718be9a905c. 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/QZNWS2419898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a3260bfdd8d77e3b9f7248f2be6428411491402cc706d461399ef48eadc0bc4. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/QZNMX2498178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedfa8ba021923a7891845071ea760c8c820e973c744d76990342cdb68aa102a3. 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/QZK6K2534677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf106d885fab8ffe851e5c1b66a3a76aaacd5a2b53f517641dcb386dfada2ee57. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFJ2505456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c00e06650c7efe31f5062e2af027bf7aea86606c9cec932018b6ffa0a7998de. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/QZWFJ2505430.