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 0xea45d708e43a9043545a2ba4e5462a0f4239e7194921349b88e3fc36fd01358b. 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/58655d20-7f06-4cbe-89a3-2d744715bf3e.json and https://artists.proofprofile.net/proofs/artist/58655d20-7f06-4cbe-89a3-2d744715bf3e.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 0x413478463dca6dfef6fc4370d91a547b1c10dc0e41c141e68d046f99b04f1858. 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/US4NA1110065.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65702f557bd7504d0f340f0c3d8cc17707ffd59f58ff9ecdf11a549a6e6a0fd2. 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/US4NA1110066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6a7dc2e2080201dc2975aa74c9852d4253a0e62a847a91bc1f7fc5b6ca01521. 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/US4NA1110067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96811ea76f4cae3f0b743ea8064c3fa8664ed56ceba81c92753d0cc6a7215345. Chain 2 (Bitcoin): anchored in block 960185 (2026-07-30T01:32:48Z), 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/US4NA1110068.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dbd837b900337cb3b8422751787dd8cad434e2a96dcfcb0408bd7f1f323d878. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/US4NA1110069.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1af1b74c3cc5706f6008f1262700d54f83eb8ac784935b720ced0cc3b7d407a9. Chain 2 (Bitcoin): anchored in block 960198 (2026-07-30T02:21:55Z), 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/US4NA1110070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x34b4d3b44bf8c12c7e45890ab1d326c99ff04e94343774b62778914126c16493. 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/US4NA1110071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x390c93c2ad4a072c944114267e6103d5a9a75bcca3ce4f83067239aac624f7e4. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/US4NA1110072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c23369908251095e132a85544b233627321ad3320c3ce22126f01738fbd207e. Chain 2 (Bitcoin): anchored in block 960264 (2026-07-30T14:36:16Z), 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/US4NA1110073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4819ca53bbc034f36dc1c3ecad274322b724594f872e8aaa459f3ca19d3965c0. 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/US4NA1110074.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe792dbe474b94fe1122b441c2370cebf4f1c48e8baae88ec795de96fde0fecf1. 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/US4NA1110075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d15e8f08b61892188ebcdd85db4085793027a8ec346dc70f0ec8760322c41bf. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/US4NA1110173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cd6dfa28011db65e64c72ad59b2a6442d03508a3f198d34f932702f93c6ac2b. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US4NA1110174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a352b87338728bde1bcda00c3353c680338731890caf21bc230d322ac993a47. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/US4NA1110176.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54744cf7be1473dec3999eaed5e07d1f8ae1afea5bb0fd94462abdfe4621e257. Chain 2 (Bitcoin): anchored in block 960212 (2026-07-30T05:43:45Z), 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/US4NA1110100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8817abff6891f33851013bf15b81d47bb47475adf1df342658c6c5f1ea1e124d. 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/US4NA1110101.