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 0x4e36be75a93b5f6c24cf6e4a0511fe533496e4fc1944915199dbe4587fd82648. 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/86c2f6cc-5df7-4dae-ae35-fdeef7ba1dee.json and https://artists.proofprofile.net/proofs/artist/86c2f6cc-5df7-4dae-ae35-fdeef7ba1dee.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 0xce14725455a9f6401dede38a851aaabd087abac4984e24c252136e3e3f376cb3. 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/USCGJ0998430.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c53d21e85c61348846f8d0a427250f2e1ae580decadcc89f27172c117d73bd4. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/USCGJ0998432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef664ea2db1fac34fe8ebb89e73c5171e386ea9827ec71770c5bfbed45e1c1a1. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/USCGJ0998436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e22aa7a9f743dc7644e407703828c10346e12ae03512a24120e0e8ac08251fa. 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/USCGJ0998438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0864236dd3e93cf541fd4c3e626aa739e208587f409b4b29d75dd1b4c473cebf. 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/USCGJ0998441.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3d4e4e7d7c1208c3afb95690638fe9f0a34fd9fc61729e04d5521565a7a8c340. Chain 2 (Bitcoin): anchored in block 957898 (2026-07-13T19:28:48Z), 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/USHM81151800.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dcaa89e1b55caa6220249142faa574168cca683e24fa5cd70cd260760cac2bf. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USHM81151803.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91b077d74350a88b63a4dc69af1d15b821ea0bc16cbefc33e397c9eb4c79843b. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USHM81151806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8efd94efdd5224ac31e57d91ba2bddb84916eb81e3d1f5458d56481ac1a10667. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/USHM81151810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f574c95b44b9f95f1afc14a13755c6e7731d7358fd41e2dd4743e2d9029741. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/USCGH1404166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad415e30931b7fa062d190f7a945db745a9a5e2f3de0b617bd829d91a146543a. Chain 2 (Bitcoin): anchored in block 958738 (2026-07-19T13:10:36Z), 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/USCGH1404170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e47149bc077dbb7394ee8279db946357aa56be76ad6d50471d4ce449c587b26. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/USCGH1404174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd479933c07f552bc5a62933947b6d5e0ba3217b3162366fe82fc7d6cb5044cf6. Chain 2 (Bitcoin): anchored in block 958662 (2026-07-19T04:43:15Z), 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/QMAAK1642940.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6b8666a6dc79f3811fce90aa21bf7c1f7c521ed294eccc9a135a5c11b4ba2bd. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMAAK1642946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa363f808df02b913756e61259e5c85eb2d609708b1b206a7bef6107438ffb1ce. 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/QM9AA1709309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe140f7ab721597809635e63a874dc82f37fa72dc8a7242f535a4024221960fdd. Chain 2 (Bitcoin): anchored in block 958590 (2026-07-18T17:28:56Z), 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/QM9AA1709314.