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 0xf08d876a02e07a373ad98047f469db8d1e7042693b19e8299be3e617a8df4ff3. 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/5dd9b23d-dba7-4cae-9897-048650f87be6.json and https://artists.proofprofile.net/proofs/artist/5dd9b23d-dba7-4cae-9897-048650f87be6.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 0xb0343dca9f9e3c40aa362fc7bb447284956966be88b080e97a979b9a6e9afa2f. 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/GLAAZ1600203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x409cd02fb028de8665ba132c969e780241a7a848bdbcbd1d73b5f9da54bbaf69. Chain 2 (Bitcoin): anchored in block 958870 (2026-07-20T11:19:23Z), 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/GLAAZ1600209.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfe0c6e20096cf8290b661b53204deac1105f9debdabccda99f92b072e2572af. Chain 2 (Bitcoin): anchored in block 958585 (2026-07-18T17:05:16Z), 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/USHM21957559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dc3b3dfc9b967deb2ab722aab7f69d50d86ccfc7a0cb33479fa11de0161aa1d. Chain 2 (Bitcoin): anchored in block 958194 (2026-07-15T22:59:26Z), 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/USHM21957571.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7eac78d7a227d9807fa8bbb7d27523cd5e999542c940db8ab624e640db9bf757. Chain 2 (Bitcoin): anchored in block 958197 (2026-07-15T20:40:29Z), 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/USL4Q2264907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb10d7fd4d22c328102cd9f7802d6b71bfa97ff2e803d207a3b88cec9c054516. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T12:51:14Z), 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/USCGJ2387682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778308905ec97cc0002dc40c90c6b86e9b6386d302bdc3a9bae733dbb51555dc. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/USDY42397397.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f36d0e1b5fcd78c355dab1305b9e31309250392d0951ad59be0b3d05ee2aad4. Chain 2 (Bitcoin): anchored in block 958901 (2026-07-20T18:01:30Z), 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/USDY42460036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431e235db9a5d9587ecc10356d7b6e8ac4852163fdd16e75018725a5b8d2efc9. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/FRX202514696.