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 0x3d9c9ef9a511f5307d50a233dbad58a7c62a165873d884334f57a4d9c0bbc591. 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/493dc2bd-73db-4ba4-a4d0-31b5707f53a7.json and https://artists.proofprofile.net/proofs/artist/493dc2bd-73db-4ba4-a4d0-31b5707f53a7.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 0xcb6c2877298dccb36df0d6ef44bab45ac96fb234d675457056268860b82a06ba. 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/US3DF2493535.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc9c8aec3ed265305965035c6ed258e019e2ffadb2c46119cae11d52cff2f4326. 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/US3DF2493561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xddbb11a0970d765a1e48287348c1b66484c8f3055715de012b95850902db1929. 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/US3DF2493532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716a0699d5509e7263510de7eb9210103daf1f24aa6b59f524a1cdda3511e83e. 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/US3DF2493536.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91ab1db6bc04c7eba94802d36159f8b6545fdb3f25dbef0196aec8322b57403e. 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/US3DF2493565.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62a658449803734f9a14c28c0866f8d92f69f2fcffd57e26ce58171e33b2c1f8. 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/US3DF2493533.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x285529306dd520555f93a389bbc03f464a8c4a127c59c261559bef8c5cf3b9e4. 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/US3DF2493554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b568a3638c24b61dc46980cfb2a7a022b9cedd4e46da65558fa998c087197ab. 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/US3DF2493556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7ad7a612516dde1ade860275f17cc5692ac302321e7471deddb255eee440e89. 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/US3DF2493559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82906d3e7e6f464d98ee655e860ec970f8778072baf55dce556e8784c5b49166. 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/US3DF2440881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7a8e5769788ae0fcbe0fe84769ffecb94b27d2eadcc1c6d6722fa5bcc857f2e. 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/US3DF2440865.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1817970b462b78321cd177e175ee0672cc161ac7d6b0c84d761270956f2b59e8. 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/US3DF2440882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0039693b31cc7664cd844f7b1a3b6516e9c347c167b1d48806776360b1b07523. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T15:26:17Z), 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/US3DF2440897.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x119d4e4508524591d2ae3b44ef56326fb1559e1f86eedcf5c15faac8bd9bbb89. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:20:12Z), 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/US3DF2430421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79bd1deb42a7a1b20d12be838d4dbf4a506a24ca5bcf9e04b01444d8deed904b. 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/US3DF2488297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ae06bb4d1612c4ad390e743a49e236f495d7186876a229c4997f2be5da3cb3f. 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/QM3DF2421453.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf68d43b259dfb2b69695a6f2ef0fa7e12b2ab903a90a86f5325c15d1e03a0057. 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/US3DF2444391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x133269f3af2dbcb73fd55dae405c854a4a18276ddcc1bb7d04601613f533544e. 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/US3DF2490955.