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 0x781b4d9d8a0d9eb5eeac1586da169c8cacef54a48b4b72833e6676409af9b55e. Chain 2 (Bitcoin): anchored in block 954500 (2026-06-20T04:47:29Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/9cb7e9dd-b1a3-430a-b6e3-5e151076dce1.json and https://artists.proofprofile.net/proofs/artist/9cb7e9dd-b1a3-430a-b6e3-5e151076dce1.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 0xde06e023998668292c1de7e08d12e0bb6063d6936498cbfa4fbaab257b009683. 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/GBLPF0238496.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa18517587edc62d83a8b5591964dbcaa579e8e33466de857c0884daac4353a62. 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/GBLPF0238497.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x566f9b018f0e596d69f422502814b814dbf390720df5f97c93e19e72e06f269b. 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/GBLPF0238498.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31c20fa3aed0a8a3a5cc3284d6fa35a1e8cdf6d98e3ad09f8c86251a9abe75eb. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/GBLPF0238500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3945d80a3b613f63655b7e2d3e0f20f4528b113799f146fec9ba032f5e4e0ccc. 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/GBLPF0238501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x979e44bedd0ea59fc05a22c3dfad3ae68da1b28a1304a9b2bad1dfc5c26e08e4. 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/GBLPF0238502.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60946eb203250731a0380d78b9a524ac303066a7f6d653dfea77fa0976404f3d. Chain 2 (Bitcoin): anchored in block 960166 (2026-07-29T23:39:29Z), 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/GBLPF0238503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8c5de03dca4c242f9c137f899e8a69cbe27b93470f6826b31e94fc729f7bc54. 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/GBLPF0238504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x893469a00148f2ef9758c886a529176cb519d9e6c4abe0283bae479561bce8b4. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/GBLPF0238505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07033e24e702a0ddab19c93bbb3612832216fa0e4e85a3a6046aa2ecc17e760f. 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/GBLPF0249647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc8114aa1d4a149fb43c65db5a3202d5e1a58a7a2cef68ffba401d6c7051b7bb. 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/GBLPF0249648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c0748de8797bcbe184a898a2c73255f72c561d0d04035552250abceb51ba5a7. 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/GBLPF0249649.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfaf67cb342b5029a027ea9bf1e0ef1ed5dd5453c024816c711b26b7fc93faacc. 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/GBLPF0249650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0b8e3f9dd09be85d833835c24edbaf84cfe01f61094f338383ce7e16cc08203. 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/GBLPF0249651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ce4b43dd0c374327eb23afcf8a76c34df5d718a3574d03c2eb414af20198819. 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/GBLPF0249652.