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 0xceece69bebb193ca4c38e1a96983d6a2ba7c585f352ef744ae92d33ab39446fb. 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/f34076f7-70bf-4da9-bfac-06834546fed9.json and https://artists.proofprofile.net/proofs/artist/f34076f7-70bf-4da9-bfac-06834546fed9.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 0xc84fc3c9793d009339cf02175dc89d4c4a57eb349607fef56de82e33cd90415a. 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/UKR6V2112357.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a22c847b3fdf83bec45e5d42bb3b1e74d1e5a9f2a338d96df388b9bb7cde6fe. Chain 2 (Bitcoin): anchored in block 957805 (2026-07-13T04:34:37Z), 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/UKR6V2112355.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f058f12468130a51273b63dac6cee472e47b0e2823882dbd0db6f67caea546d. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKR6V2210194.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87a84e8c70a49128d77f56a2a8ed755608b75f86097b1defa31fe48a974f750d. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/UKR6V2270896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc48422e1e3d5d72c3467f031d64b3acd67da033ab6ebb9c98cf36cf1568c8d5e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/UKR6V2211501.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c48356841a66dd86a128bad30f3a78c08f19c17a24d14d5f58d3f938a7539ca. 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/UKR6V2211503.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf312270cbe79945850ff65806df2a908b6486fd5387abb20b55dc7527c8de8de. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/AUKDT2300100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ac71c6297acddbeedfef7e1bdc58bfa9660a4fd0dde36865ac133dc5267eb34. 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/AUKDT2300101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd8c233413ba619c6959aca88e3ef55f0e7adcb2c661d00f18a11704f18ef3f8. 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/AUKDT2300102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30162c92d57248495f4cc54114e7265e4aa4271942e1759d89dde2e1a609a14b. 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/AUKDT2300597.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8821d8e2df202b7d20f74aa21c536af83cb7df01441a29ff5588c6a17a99e17a. 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/AUKDT2300599.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabff52d8b78d7d21057b6ee72c26a2902314377996b8278e6875b2c98c3f8449. Chain 2 (Bitcoin): anchored in block 960220 (2026-07-30T07:28:30Z), 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/UKR6V2213133.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8867181069879fbf359f3031f2492cdee2d8bb8e5191630bac37aa7b5af235f. 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/UKR6V2212569.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490cbfa0d6c58a91c1d8447edd9c33cdd0aae11f286e77f74da47ac71da5166b. 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/UKR6V2212571.