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 0x178e32890ca6ea25e56f0865bc5b2bbed16c45ede4d25c4fa24b263fc7456241. Chain 2 (Bitcoin): anchored in block 953684 (2026-06-14T19:51:57Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/66094b3f-fdf4-4892-9db5-e8977047cd27.json and https://artists.proofprofile.net/proofs/artist/66094b3f-fdf4-4892-9db5-e8977047cd27.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 0x627b93581b5a9ed810fee4eda56f58a242548e6b32818ba573f276d28509e3ad. 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/UK6821634101.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bd817d2efbb1d31d3a13371976a088633c8ed067065159d9618b9b85bfbc733. 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/UK6821634102.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd46df9a2128d4dd077949e08eb873b465efbabe2de4966c4edf7f395ad9490f2. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/UK6821634103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5921e5e043cc65a495e2d5a0b715f6f249fcebd54f6838947b834f6f6f79603b. 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/UK6821634104.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6a7d5095a2a85379f4d8df2a28cdedb16c10013b57ff5ac778430623ca0e5d4a. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/UK6821634105.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc802144edc02fb7a28029332d9d1086d2918bad1e73cb473686b28b13074440a. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/UK6821634106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3aac8fb65bbd8ff0afee43d3fdd38ae3d98844dbc60bc5ba2661b62bd14dd91a. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/UK6821634108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x65a25524b6456de8e12d6e95bbe935694753ab8b436b937551e5e55f5164a4c1. 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/UK6821634109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdf09163f13a72c9f1728b2cb6bfaca3abaa2e6ca8a8a3f8aa5bfb3bf823f62c. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/UK6821634110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bbbe6f7bb2518703b36fa1044ddfd576f0c5794274bc2abc1b796d1862b2cfb. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/UK6821634112.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfebb59883d24b3bed03f3d5fb4c2d4294f14d6f882efc618b868e61d2d3120e8. 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/UK6821634113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf486de7a9c73fcb4058ff4cbb8c559e42e2ce8e391cbc152f311642aafbab0b6. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/UK6821634116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6705bbcb12d9b774c8149a41cd1f1dbb5e85ac9fa6ea5371f62281b0a2dad720. 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/UK6821634119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x267488fc90a885cb2710dcd04b4423e6d889acb75f42529b9aa9d1942d331b83. Chain 2 (Bitcoin): anchored in block 960231 (2026-07-30T08:33:28Z), 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/UK6821634120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff7b07ae61321c55f765ae9fdc9e8aa55a7e932268ea6c880bf47d6ce804ed5c. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GB2LD1900342.