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 0x9a3b845853978c20937804b5b64478f8a5c5e6d4de736398d00f818a65ed1e83. 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/417373db-0c51-42b5-8c0a-edc36eb05beb.json and https://artists.proofprofile.net/proofs/artist/417373db-0c51-42b5-8c0a-edc36eb05beb.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 0x10e005973bdca04dae9b1f5a0ae51a0275d9322a8eaba3c1021e94c7fc424f7b. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ESA011934466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x592d36d667d1d8de0bb08b5ebdd9feb505271d106181eb7608e45dae757810ce. Chain 2 (Bitcoin): anchored in block 956637 (2026-07-04T10:56:23Z), 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/ESA011934468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe10ea7f4fa41bf586e79b27540bf3648f1003fd067193cc129913f3de3ab5228. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/QM6MZ2073245.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfb1b4c7eb172ceb8ade626b227a5a5c68f9c8d9e83116609f7b589152f22bc1. Chain 2 (Bitcoin): anchored in block 958346 (2026-07-17T01:47:42Z), 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/QM4TX2102992.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc38bf8a202cf319c434009248783550f0cd24912970a1e2f2e7483603444fab6. Chain 2 (Bitcoin): anchored in block 959043 (2026-07-21T18:40:26Z), 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/QM4TX2105211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c3f2743a027380e30f80e4a2e8f7dddbbfbaf396dcd6ab3e704e76de1f07c38. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/QM4TX2105237.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa132a986d3a065913b2d820f86fe7ebc8419b89a8f6e56fdd78f65b097316d8a. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/QM4TX2105247.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1992e64d6f8602d5062ed0e24b2114892e8b1a62dd8058dca973be6564f7c957. Chain 2 (Bitcoin): anchored in block 958489 (2026-07-18T04:13:26Z), 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/QM4TW2247433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca06df0a8a57153194ac0698197955d30febb6a73a840a21c3bcf4c96af1a3cb. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/QM4TW2247435.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96bd591fef2b60c6a1d9d2ffe679511c1bdd3a6e39c7c00b799e8255587af25c. Chain 2 (Bitcoin): anchored in block 957747 (2026-07-12T19:35:06Z), 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/QM4TW2206851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e64f147c5dbb1f2c1120c666efae601ab3b33255fc607aa48fabe78bfa654f. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/QMDA72134604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e22585416068a910ef50fc0e38e2bef009f43f38d9335f06eeb7ea6f8ec2491. Chain 2 (Bitcoin): anchored in block 956738 (2026-07-05T04:47:21Z), 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/QM4TW2247436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0edca78405c3bb40ccc02bdc6a1b35751c6c620822ca4b06e1185d8f5f8a5488. Chain 2 (Bitcoin): anchored in block 959058 (2026-07-21T21:09:36Z), 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/QM4TW2247439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42d092cf6279f7d3e0dfd61c746d6c8ee068e4e4939b02f084ca6b669d42b101. 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/QM4TW2247440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc0eae1dc7a03fd1afb2310e06590683256934fd09235f73108ada1ec93a774e. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/ES5152000831.