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 0xb8dac782cb4f3396f0a36d4d783bcaa32f9e2b6a10a8f29f767dca84c7c22b9d. Chain 2 (Bitcoin): anchored in block 953997 (2026-06-16T20:07:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/25eee1fe-7465-4c2f-a8db-a131ac7b3ea5.json and https://artists.proofprofile.net/proofs/artist/25eee1fe-7465-4c2f-a8db-a131ac7b3ea5.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 0x28fbd1928ed228473ff6c4a2eb0fd95ed439c4ec06a616b8e7781c581af4fead. 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/FR2X42157839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa21241a51681d70e844fad422192235cf98bcfddac9aa1f7e6f5b56b1c3f3e4c. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/FR2X42157840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x442cf940786379f7ceb3fe316acd25397e8557c0a8c0f8db0f3fe9643275bfa0. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/FR2X42157841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe913b83a61212725ed7bad4439f425620698b1df9c1eb991725c687c043c8e13. Chain 2 (Bitcoin): anchored in block 960191 (2026-07-30T01:51:26Z), 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/FR2X42157843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b04aca9efdde9e1d264cbc1b8588ab753ae7f930a5619d8d2ba1d86fafd13f6. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/FR2X42157844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96555c5b82924d70ec1668017d74263dee80946986f1807b2ce5ca039aa0eaac. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/FR2X42157845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9283798361339218d4763fe9a7d9bb0ccf5f60f637cc75c394301b3422fa4c6d. 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/FR2X42157846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb87ec908f2763bb4f595ac4bdb8a068f0f8317e50b4265671c94a9ea141ae491. 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/FR2X42157847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c5d81c5f5ea8eddba89a59e05c67ab0ce38b60ff91ce4c493d79d0c15f720c4. 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/FR2X42157848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892897d12ef05e2a0d7803755e314ac9fad71180cbb725edf85f5bd763a6fee0. 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/FR2X42157850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b6f074603d906ce6bef4ceba338d5a5ca29f9ced4147504526f41cfebe5152e. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/FR2X42157852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9776b946dcc5aace1ebfeb454fcfddde698ed1c041e342f4fbdbd39ecf6c0c87. 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/FR2X42157811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f4d949b93fb762de39d80485677433a42b8a961160d31c18e1d61dbd0229801. 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/FR2X42157812.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48b96002ee2cef3257f6ce1cdc2f980bb79c58898bd3c51914863899d4b94837. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/FR2X42157814.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dc5f2d4e89996656663e449b7c4518c81bdcdc8dcc585ef53f54d6f29ea5078. 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/FR2X42155523.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7ab3c328e3ef8847c97a3638e1a0d97f25ddb8aa98950eac9924239b75d5734. 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/FR2X42155524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25083b18418d0ae1a1db3b3da9760b215efe790c7d343576cc7827ac63e6bb3e. Chain 2 (Bitcoin): anchored in block 957057 (2026-07-07T15:21:38Z), 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/FR2X42155527.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c5bda515a64496dc7f55db48303f6c177352c3c6a71c854c5437b4da702dbe3. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/FR2X42155528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0981117494c9883a024d71a9343afb57e7f932f4adda15ef6cc2faeb3be5aca8. 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/FR2X42155529.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x193f232b2d0e31ab5de83c6bc7a9255d6e21b64f8d42d67808a9757cb1ad9e61. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR2X42155530.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e7152e331ba9a43e23c66ab29088461f197f1350dc32e25f2307b33c55e7758. 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/FR2X42155534.