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 0xdb7498aa3b54b12b706f7ebcd0451478128340028b08c084d40bf06d06268c35. Chain 2 (Bitcoin): anchored in block 953877 (2026-06-16T02:39:16Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/08ea6d2b-924b-45ac-b7df-088fa66d3949.json and https://artists.proofprofile.net/proofs/artist/08ea6d2b-924b-45ac-b7df-088fa66d3949.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 0x7d7156b928826e676f3864424355007c7ee96d2b308c495cc184f9adb0c0de5a. 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/AUUF11501015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc295bf8341a505a39b656d162660051f59bd5ed618c22f2cae82d1642724ea0. 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/AUUF11501016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb45f108b7e2478df75138a3abeb16e51e2053f5b358c4ea2f6b8f127cb494c63. 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/AUUF11501017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x751b0021ee658750930e5c5bb691ae52862fa7519c6cb666c89f89b365d18825. 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/AUUF11501018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69852af17489408e2cd448799fe2cf4ad40776cc17ba14a7eeb219c73975ebb2. Chain 2 (Bitcoin): anchored in block 959114 (2026-07-22T08:41:42Z), 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/AUUF11501019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b3f26ab8b5b5c05a2672ebb45610fc4b115721e0ccb4a871fd365e51e258089. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/AUUF11501020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501e245986b6d9da64bbae808fa6a3f122bbdaf8e64853d7353a85b479a3ccda. 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/AUUF11501021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c9738c493e3d634427d64b42c0789a7e65350bd4ce4362c51f75e565e027f52. 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/AUUF11501022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa311f0f01dbd8237002148318cccde68d58fd421f3937d2fecf3930fb2c2ab5e. 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/AUUF11501023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee13fddfb10759ea6df95322afffe0df8836a3d3f2aa4c50c3245bf078792776. 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/AUUF11501024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacf47aa22326d2433c1d516092532909f33a0617728c5709200862602a3abf75. Chain 2 (Bitcoin): anchored in block 960309 (2026-07-30T20:35:49Z), 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/AUUF11501025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe497290bac045a3da22e4930731ee1e63575049381fc78c93b9e3a2a2f8ba53a. 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/GX4R52163626.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07d85a6524db12a7a2f3254eeeaeef0ff27e7aad1575f02e6b196e30de245959. 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/GX4R52163605.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8e2a2ba801f715db19f23e92f609dcbe61cd41f94a1c82c9a59fdfbb4a81e0bd. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/GX4R52163606.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd0079b225f2737555eba9b34d0e5eaef064bf604c94d9a9d04c88e685f27e2c. 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/GX4R52163607.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x590491b6c5cd9b3b3c832a3ef028a8c9b5f126ed8f7aa17a46bd1e4a652e7f69. 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/GX4R52163677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94f215fd6389592df13062e6484af155680ae9bb593d641bf9ee866ef63b5223. 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/GX4R52163656.