thumb|215x215px|Port of Aden from the ISS, 2016 Aden (; ; ) is an ancient port city in the southern part of the Arabian peninsula, on the north coast of the Gulf of Aden, positioned near the eastern
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 0xef03001cdd4b69a8628b82ef43b427a8c4dc8c5a3dcbe1bcf64cbb8912036f9f. 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/6eff7af6-66a6-4923-9501-874627ad2b2a.json and https://artists.proofprofile.net/proofs/artist/6eff7af6-66a6-4923-9501-874627ad2b2a.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 0x7bf552fcb48c389995f4b8e2b7d6076d82d12fc3f57ce63df9a5ce4dcdbe5bcd. 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/INU252204466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa74780913c9b857263287d2a8c7f16171418102deefae98a19d7af660657c1b. Chain 2 (Bitcoin): anchored in block 958742 (2026-07-19T14:09:34Z), 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/INU252204467.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d5b345bd344c4657167691bb0de28f184f78ee1949915a8d2da2652f5e93ce1. Chain 2 (Bitcoin): anchored in block 958639 (2026-07-19T01:18:30Z), 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/INU252204468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15f0e8488db5bff13c44d5e18d262150b2045140d1407f6de008103b121d5b37. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/INU252204469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e479110755510f1f2bd6d42fc1a7def12d57859f256a3dd394ad9764925a0bd. 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/INU252204470.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2f2112849905d5fe1e60aa1cd8e30615cb1625eaf577c6532d5fb57b233361f. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/INB942204124.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45054385243bb173c2cc76cfdfdc9febd5163737b9a69c855dddb6d97f7bd173. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INB942204306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7602c74222212df8be9b1bb102a530e7b4262b06de64d2c00f0fa4307eaa8263. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T20:32:27Z), 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/DGA0H2432640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85fb5f2fb4161e8f05ee502cc4cb1960fbf2e0ccded5ca7525558b8593cf02dc. Chain 2 (Bitcoin): anchored in block 957846 (2026-07-13T10:25:43Z), 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/DGA0H2432641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d4c772a752d5c25bee04547895dd5357992a97d98d68ffa9adb55c37c66ee01. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/DGA0H2432643.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc955e8e8458008f592388f6c9efdeed0b4527155436b3ad42e8bc900a73379f0. 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/DGA0H2432644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fd4ea0c83914065a806de4963333558145ecd29749025110c2ebcc67c4daa47. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/DGA0H2432645.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11e7a88e7a7cb15e4a3a679e0dc30c41510057318f3c059b223fc450c8e2d0d. 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/DGA0H2432646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4245b6368af9bde3ca43a47ca6bbad225480a696483cba40725a37caed1e4460. 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/DGA0H2432648.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8dc23f7a318afb7b8a6be7a76920d6efcb76ddf462db5e74238cb246ff8e8be4. 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/US38Y2410218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6449764f2282c8933716b8740e77f4968aeaf831296201bcdb6309cfb367db2e. 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/US38Y2405777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a6bd670711aac7d8270b42529a10a333c2715ee7835cf47fffee0fb29d34241. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/INUM72400525.