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 0x7be3c1eceef6c4701c02222f9911b2da03b2ecf6f029e0977d84b75a3f4190a6. Chain 2 (Bitcoin): anchored in block 953786 (2026-06-15T12:56:12Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/da42876e-33be-4e12-9902-efedd3da6338.json and https://artists.proofprofile.net/proofs/artist/da42876e-33be-4e12-9902-efedd3da6338.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 0x77804f8d9ed06757534642b3a79ba85f51395f3840860291074d1da324b03a53. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/QZHZ62009805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa51240507afdab22a5051cdb82308725bfc5debb80145eab32d29a3bf2e96ede. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QZHZ62009806.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55a6237d24f2f60fd735018992652c3d0d7fcf7513bffd7b98efd8b9cf3a46c8. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZHZ62009807.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb61a47edc253befc130784158ccd0bde912023101f740d3333d5e37606b9038. 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/QZHZ62009808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2438722eb5a660b44fc080e45cee4b38ed3739426de3478cd564bb33c4cf077a. 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/QZHZ62009809.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde1a655e06476abd26f59cc188d9056fac1d95ff94f324603ce507d8b6cdd637. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHZ62009810.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7f8c8d5d7a559e7886cd356f55af69bf311e4fedd92da43ed4ed0176941cd34. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/QZHZ62009811.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4965c069e49f71cb0a3d203a11c84d65b6f17c3a33a0f3575726b2fd98fb3aa8. Chain 2 (Bitcoin): anchored in block 958430 (2026-07-17T15:33:28Z), 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/QZHZ62009813.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4716ea4b3810ab31480fe099dc79536c1a1578b1d8dabb48db5d4701846018f5. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZHZ62009816.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb688aa829d3f8a8f52fc6740eaa64c7f2bcea000f313194712340b06202d6fce. 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/QZHZ62009817.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f12d009f192e2c85a2964b8fe1e187d9672a75611fd0aac795ea3fcdbb78d34. Chain 2 (Bitcoin): anchored in block 958631 (2026-07-19T00:50:09Z), 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/QZHZ62009867.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9714a215e09cca29d13a86240ef0fcd984c98c921d3e6468c4cd4d62e0558724. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/QZHZ62009868.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x504ed7453ae45827b8841be7cba273f37153876d4062083c4bc24befaaf8b4cc. Chain 2 (Bitcoin): anchored in block 958234 (2026-07-16T03:46:09Z), 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/QZHZ62009869.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad0cf8eac3f768032e7d2b8b79e6a0dcfb955688c9ea86700addfc52dd532a5f. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/QZHZ62009872.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x819200b885111eb672e3123f871487311ffba9653207fe5da8338360c1f5ce94. 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/QZHZ62009875.