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 0x2336760c81539a550f63e8dd7261d20e9bec1e58d7f66c730b75bf4dccb1773b. 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/6cc27665-d639-4ec5-acd0-320d24c79e73.json and https://artists.proofprofile.net/proofs/artist/6cc27665-d639-4ec5-acd0-320d24c79e73.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 0x386fe6edc8f7e9f23c632185843d112e1f5a0fdb5b7bc7004af3dee21087db6c. 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/ZAE080600246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc881b4baf646f0b2a4690d90f10a20059d85aca35df0b26e4f3638af100e4834. 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/ZAE080600249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x068aa19c586431ee2dcc95a90a9b9aed28de03013271d74da08208b8d6674c47. 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/ZAE080600248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc881b4baf646f0b2a4690d90f10a20059d85aca35df0b26e4f3638af100e4834. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/ZAE080600249.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16372f7687a619f0032e2854314b4689b851fe4f25ac089a017212b5e0524df8. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/ZAE080600256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x856e620131e1dae7016d71eb72c51e6912dfc0ec4cca7492f6fea4e9c215321c. Chain 2 (Bitcoin): anchored in block 960340 (2026-07-31T03:15:04Z), 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/ZAG931100166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53e2c7ef50ffd5a879e8b9e10476ff08e7b591c04d25a753891904ba3878603c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/ZAG931100167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdbed7212f6b9f7c2dc718c21c53889f74b9439d3aa16c01c8cf63a089a2580ff. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/ZAG931100168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0408c6e035796e0ea06c012566f0c0400113b47884366f7def2d8d311a6fc83d. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ZAG931100169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e8875c9b8793868a1722df49147eae1d958da96ebc6b3cfdff53d10b606330. 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/ZAG931100171.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe41a56f9540a0b57145731ef6125a00dab0a44f7f7bac30bae101785f597f6f1. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/ZAG931100174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa039693d70306298cb1ad440a0bd537d7dfdf2d2aa558e7b0d4e409e4600a9cd. Chain 2 (Bitcoin): anchored in block 960273 (2026-07-30T15:42:38Z), 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/ZAG931100177.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb8385e2974b5f8fe92abfb265d87f716bf87401d3708b2399ec593ffe1681cbc. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/ZAG931100185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c934363da88702e3a5068d1049b63ab0c6aa56f899048974c8de968adb334ce. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/ZAE222200070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05472540da157f39a8e9f9b85237da757ae0e6c26c33a8e9e1f940db129fda2e. 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/ZAA641100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x921f2b6091122f5186595f5369cd258382a86ba92ea53fed0c597ec4c5e1d9f1. 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/ZAW761300017.