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 0x88de1ecd825322a9831f65c51491d098b4eb1edba76fa84d583bbb0159b68e03. 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/4de00773-06fc-42c7-adfe-591e1c6910dc.json and https://artists.proofprofile.net/proofs/artist/4de00773-06fc-42c7-adfe-591e1c6910dc.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 0x15d726dfc09bfec72fe4c3eb502ba55728ba6c60d1d6df17a5ebabc9b15dd213. 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/QMDA62242624.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72b966bb3170317d78c3fabefefc5ebb3bcddff3dc29b12bc618e1d607c5e903. 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/QMDA62242625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x920f8f2bcc1723ed6de967ff96eae9ccea22f092581b8b0dcb6101596f8a03f8. 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/QMDA62242626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd7083f34f3f30b39743c1ad515f99160171e746ece5b07cd209ef648d190eb7. 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/QMDA62242627.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c4f635f34028e1daa15eae04c6e25d5469cae075cbb71867ee4312222a8f5f1. 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/QMDA62242628.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaad9e14853b205a770899b53ad82214ac72f08bde979f6c63f975c1f792d0e9e. 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/QMDA62242629.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec531440ce942ca41007df045d067a498b26b1f824daa036539ceb0c1e2199d9. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QMDA62242630.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55b7fa38b2143f352a358cee0d46d7baad654197da73590237d8c6a8a63b2cab. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QMDA62242631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07c880e2d3c5e23bc1a2a0bbe3be3a26716ee7ff6ad364497d7719627c4aff55. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMDA62242632.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c7d813fda66d4d353584a612045ee60f731321b432f4fa3be40a61e9d25d2a2. 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/QMDA62242633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbde7bb4cea5bcdfed2fb40845a09ffa5e73cd976565ccc5b73d51e2b0d73db6a. 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/QMDA62242634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf563c07e1819c9871aea389814a84eb5428dc8f6299b21386e82d1e71a39b1a. 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/QMDA62242635.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14d64cfac5a768b5a8b3c3efaaceffb3ebb255f301b12d29bc25a2b282fcfbde. Chain 2 (Bitcoin): anchored in block 956859 (2026-07-06T01:42:12Z), 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/QMDA62242636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57f93e8916789cba84e336b1d87a465c093da9d462f8a4ee371eb94722678962. 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/QZNWZ2244825.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9707dcb8a81845a8cc4107e7ac085a0f2bc55e078d981f7e2051270a5ec0b91e. 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/QZNWZ2293533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfe4f81ec1ee998be67aad8f66a7612a380aec28d6204a185d76ceda0faff992c. 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/QZNWS2135856.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb868734282ec4d2f700b2717be4d438cfb8ca6f63cb6f65fe355562b94e33a5. 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/QZNWS2135857.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7ba58fcfa34ac1df76d5401482b9ed52811084c035b21eb9bce95217569256c. 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/QZNWS2135858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba8ea07bf5399053ef59d0cb66c418060f3a612268c66eb28a19d89b970e92ec. 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/QZFZ62090085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6cfaf28cd1f090c7e16ade4d1996cb21a82872e3784f87321451058880f56b06. 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/QZFZ62090086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808a3c1a890457c94ac7b72e2cbef166def48a8eeb45db5359542347b56f7ca0. 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/QZFZ62090087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4f368d208a533ec707b20cc6c09b489c15a6680a9ac1ddfc3b59b9d1f6ade99. 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/SEYOK1928586.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x415c9f869e5b4080012c17005fe04188dddb24cdf0b571d18aa64018e380c48d. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SEYOK1928587.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb030147045653ebd39df5846a1d48f844b0c006e64339a1155e66d9e33d5f4bf. 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/QZWFM2452701.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee51a8bb2da88463e7bb3ef19dcb00a712648020a844e11f748365c500fdadc. 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/QZWFG2468110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ee51a8bb2da88463e7bb3ef19dcb00a712648020a844e11f748365c500fdadc. 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/QZWFG2468110.