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 0x1caa6fece6305eba6dd05e98d8d10b5c5b4ef161075c5d17325b52395662e2c2. 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/d76b2a4e-dfcd-47ad-a1c8-b82efb1c8a65.json and https://artists.proofprofile.net/proofs/artist/d76b2a4e-dfcd-47ad-a1c8-b82efb1c8a65.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 0xb765df22eb8a2c000ca8de85f0a9f1c0f251409465748da2d64d2cc8d6498b49. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/PLB382300036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba75ecc30910e56038f7754451ed830ce5c41ade8595eadca03dc24b1fdd022. 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/PLB382200351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ba75ecc30910e56038f7754451ed830ce5c41ade8595eadca03dc24b1fdd022. 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/PLB382200351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d9dafd1d32214911614b000eb42a028cfe56533ed38fca2dcec3603e8fbae7. 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/PLB382200155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0632066fb1e90c070492a9f8c552e94e80fa440393992a5208330c386588ced. 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/PLB382300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf685cbbef3aa91d9c37545f792f1cac21fbebfc7aa26f5d631b03220a3f8e03. 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/PLB382300272.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9d69baa13cff3a1ae8963afc6ebdef0f1af03a513a02e9a59931b7d8da6f2653. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/PLB382300311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0b68b54e61121bbcd3010ba84e01f95756385af6986ee564f1c3952d37f8ac7. 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/PLB382400668.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d0236f0376ce2b9caca57c8e1e18d318a7590244e116fc23fc0226eab0f90c5. 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/PLB382400505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6326e9866945b20090b71e8c54319f6d63f5e8e79d8ed297dd8dad954cf7c69b. 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/PLB382300524.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0632066fb1e90c070492a9f8c552e94e80fa440393992a5208330c386588ced. 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/PLB382300118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec630dc523dd0625fa190b20cb23a188d76eb9010f5d2253fa74100706a7df42. 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/PLB382200254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf0d9dafd1d32214911614b000eb42a028cfe56533ed38fca2dcec3603e8fbae7. 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/PLB382200155.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb52031b2e769c7734447057986282b286fdb650dc04653dd5b3fefb8f2aadf4. 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/QZTAU2184165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x328e5e39250072b5e049abe831eb1c075e28ce18ec3dde959c73df5e7da0f561. 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/QZNWS2103096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c1b92c5c0a5cde0bba6906df33b2e2dc14d8ff63e5193445a65650c29858088. 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/QZMEQ2179846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x77d15cbba6a112e7d3d90a9ae5391eb2ae409b683c49b5b81c44e167a7905e91. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6H2099071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65b9a4aaf12f31fbafe503d9e436a4d40c48fd47e528c308ed07db49c5f2832. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZK6Q2065675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4cbd9f1b5759ad6ea9a2cff3772c6b4cab7b79993433445f78bdd20407f5f706. 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/GBSMU7878248.