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 0x640ad55dcc6f16d22c7ce980c58f17f4b01ce81c0cccb1c800316dd1ad314dc1. Chain 2 (Bitcoin): anchored in block 954742 (2026-06-21T20:46:40Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/fdad29f0-25f8-4c12-ba5a-5ca01e79c909.json and https://artists.proofprofile.net/proofs/artist/fdad29f0-25f8-4c12-ba5a-5ca01e79c909.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 0x685cf6601b5120c1fb277ccf73132c06c858716e3203ec96ba8e450f2968b60b. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HUA251422708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32e022fd086612a5feb7f8ef8a03aa9235fb1b3a934406d97bf6c30ab1b7cdc1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/HUA257106109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc3cdcc8fb855320bfe0db1b124d2588e3da61aa9c3053f0c54e5a3201dcf9092. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/HUA257106112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf3d93d19652557a10bca8c6881ba4a51a55e8d24da85937890e025335399d300. Chain 2 (Bitcoin): anchored in block 960389 (2026-07-31T10:20:10Z), 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/HUA251747402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152b1be804eea8e4166720296f274ba3708b32f97f29fc954ba9dabeda537fdf. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/HUA257106104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05351ee36bb75bd6baba3f29364895200212fff879aa6c39519a407ce9d8d092. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/HUA253728719.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd40b0fbe0b3569ee7a963efac785e11e430ce5588031e4cdd976673405f90a5e. 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/HUA253728703.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa5a87becac72cf0bf27a7d0a042e8cc1e080a2c0002f7b2b06b59b46695ce86a. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/HUA253728718.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x487d2e154fa6878bbaf905038e000449453401d633764e1ee4c0a65523beddfc. 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/HUA253728711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe2c21f1862e06acfbe500e647f0a8ee40d13737e95388630164a62bf4f1264cc. Chain 2 (Bitcoin): anchored in block 958487 (2026-07-18T03:43:59Z), 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/HUA253728722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc055885850ac01fe081a9d163c5b009e391da168a12648c9f568236a1417cb4. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/HUA257106110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb7b059cd52f2a7016023fa792db68f19371e98eff84606c20fbc06e3a956bf9. Chain 2 (Bitcoin): anchored in block 958796 (2026-07-20T00:01:46Z), 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/HUA253728723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152b1be804eea8e4166720296f274ba3708b32f97f29fc954ba9dabeda537fdf. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/HUA257106104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152b1be804eea8e4166720296f274ba3708b32f97f29fc954ba9dabeda537fdf. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/HUA257106104.