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 0x9cfb04f424907e8fe71a7f1d81237c12468bdd548eb856f97a7535402988a905. 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/15a25576-ba27-4ca5-810a-c630b8a42bfd.json and https://artists.proofprofile.net/proofs/artist/15a25576-ba27-4ca5-810a-c630b8a42bfd.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 0xbb75e4a1cdfae77f1a957c2e61e176416900a921912d1e46797f47c610173a4c. 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/QZDA81974225.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68e0a1ded770c110912e9425fb5d3ed7f2267d7b8e3e4de7ccef9a9ad45b6142. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QM24S1916113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d082d6427161a483886698128980ea6c492abff8897c95aad56c44420d374a7. 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/QZHN31908715.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf771a093e7f3267d4b07f7f5f1e179715dfb5bc0cc91f689dc1800483492aee. 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/QZK6M2057895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc3f283f3be53904575763c45e4530f43eac2037c23a32042438d795aac9b5cd. 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/QZES82016280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30891894ea8c35369299714e0f0201eb7d8ce0dd2808f1de0d417933ca38ba76. Chain 2 (Bitcoin): anchored in block 960509 (2026-08-01T04:30:37Z), 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/QZFZ72048927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ee0871094679a77b4af5beb6a74aacc03cd7411ad0342e4a1ae414c38a8e3ce. 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/QZK6M2057898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b58cc1b93e0252a434188afcf362be8b869faf2527eacdf29b23d30df8f3fd. Chain 2 (Bitcoin): anchored in block 958830 (2026-07-20T05:30:12Z), 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/QZHN82170851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbcb84d210eea7b4c43cecf970a14a392a78705cad33569fd5841bcf2fa985e45. 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/QZNWR2289895.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x111b8701927b73e00df232a358ab4fea73a2133a5e34aa839699988472ea937e. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/QZNWR2289896.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0663cd8f682d8cc678e685fdf6e9cc39cbb1b04cc7c04d5a85a8b88ef7737785. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZNWR2289898.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd7b4a52d661fffb0ceb4536e6ac0702bfc3e67e0933db0cfeebb33590b6bd75. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/QZNWR2289899.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1fed8d9a02311f5446046d64dfd8774e884789ed9f81f7e63e2dc75041d6378b. 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/QZNWY2179644.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5994371aff2472459783c221e1a0e5e0bfa5ca6620da096dcc2bdbbefef82dcd. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/QZNWR2289901.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x412647bf4df2e6f45d87ad2bdca470243a0af811c0dd15f70f4e3520dc43028e. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZNWR2304846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63b58cc1b93e0252a434188afcf362be8b869faf2527eacdf29b23d30df8f3fd. Chain 2 (Bitcoin): anchored in block 958371 (2026-07-17T05:45:43Z), 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/QZHN82170851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc59df37042c64964f16338a35829ad58a31ae7339c388ab1e8fcb61eaee62ff. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZDA52476286.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf8af3e8ef6ce91c79c32b83a15a5e964f04a232faa292f0f991258d07605cc6f. Chain 2 (Bitcoin): anchored in block 958611 (2026-07-18T21:24:44Z), 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/QZS7J2400147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x279623c69d96f9ec349ccbeb3d191f78409544f6c9c61b143558a52acfb8103f. 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/QZS7J2441881.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x808250a29ff091fd35345a994719448474f30c977ebbb80ad0b4e32694e389f9. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/QZS7J2421191.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6c009c55b5e0e3eab30c05798caef2b61bcd12ae05676e0f7e2e3eb787e51fa2. 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/QZTLA2571783.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2a6d48ca615e77df269265e4464d96d8dc5b2ce6ba9e320ef9fe11426f5a9b2. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/QZTLA2566147.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b46cf24d27d08eead6e49359ba0637960e8b63dd86c4b745dce207fbb590a78. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/QZHNC1999834.