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 0x7943f890065dd97a2e6c2cd7e30110a6da734802edd65223f48f53aaf961046f. 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/d54b8f87-c8f2-4c35-9473-0737038c18e9.json and https://artists.proofprofile.net/proofs/artist/d54b8f87-c8f2-4c35-9473-0737038c18e9.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 0x5962b72a2e6e5dcdadec2e40567f974282b89e440711879c2e32f625ca6dc8ee. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/SEJMR2760014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc327c9d88b0b01d42504ce3c1b4f753fe4bbaa53c4c510fcbde382c2058b1881. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QM42K1960340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc76cb3debb3116fbf944f930127f692e16e8e0bfac0c8e22680a942be05b995f. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAKHO1904129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcda75fa311783bf93fc9fa88540d9ed08037fb3957ec78d942d1df9557cd86b. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/CAKHO1905013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a61c143e927879c9884427214b91076b586858ed9947499608a6d40265fa8ae. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/CAKHO1905017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbaa7a478155fb6f7e94400d69d10d2496424be8426013aa51d69b12afa1af134. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAKHO1909323.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8725daacbceef0c88896cbcca3ef18f34db9135ad70e4590c90bcbc4530ac35. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/CAKHO1912156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b2f20b5f4f2b649cd1210eb4938c78a2068374427cf87e7a316969af95eafca. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAWHO2015204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9eea12ee597a40df6d1602b3a8beb740f657fbb16013ffbac05451450f84a8f3. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAWHO2021612.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fd2bc600854d0ac1f1ef50060651c6be5247c5a0b68a7e330fcb88527fa34b1. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/CAWHO2026071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64bdaec01d677f7c271f827fbe91c28bc49755def0b45114e91d09de196cc655. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/CAWHO2031292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bc5b4a6ff34279243ced5eef409abf4f70b24922fd780109ffef3c220b1e94d. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/CAWHO2037663.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f232d4747e074fabc0fba8ab63a34c41b495fcdc1b9916d7710a627ca4a679d. 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/QZP7F2121512.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc7c152adbc7ba5cebd26de1036606dcefca864d841b735614ae561319ec95990. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/QZP7F2128631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a8f535d54f407b936e9787cdc12a4dd53c00b9fc0f430b00bb844466479c12. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZP7F2142342.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45e6b855ee8e1ff380a029de2f4c63f0318721a01abc29550dee4605bfd303ca. Chain 2 (Bitcoin): anchored in block 959084 (2026-07-22T00:50:00Z), 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/QZP7F2159156.