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 0x8259462bc088bdb89ccd4aaf886a34dedf4d98ebab4003527f760940f6991143. 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/21eed7af-917b-433c-b244-366a792a5bf4.json and https://artists.proofprofile.net/proofs/artist/21eed7af-917b-433c-b244-366a792a5bf4.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 0x7e5cc031b4d45add925b7f2635cae8a1e80a5e602f948bae08edf020b8cd6893. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/QZDA62101350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e81ff3b11f9102c2c9b13055387ec3c74b247ff3ab4a492e416a58a7c00a77d. Chain 2 (Bitcoin): anchored in block 958988 (2026-07-21T09:08:06Z), 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/QZK6H2153079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef1ad80f2172c969f40fa1fa2747aa28c0d91c7f821b72a83a87b7314811f6c3. 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/QZK6H2153080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x105e989cdce809d6a480362f50ee2db4a4dfe1414f662d3e860a2f909d499125. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/QZK6H2153082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fa08b436da7100347dcb23f31cc4e69ae045a247d997bf8b59315425f854122. 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/QZK6H2153085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x710ce65164dd2e8ce09edb159b2c5d7529dc52bc85861793a9fb3271d9571ce0. 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/QZDA62263029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb50d87f391800892ced67b1f7d8e81ecf61422493fac20930e4f64ef568bce2. Chain 2 (Bitcoin): anchored in block 958238 (2026-07-16T04:30:31Z), 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/QZK6F2230343.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe7102d62bb20ccbb48f949912427a02cdc675164eb6c000c1748addce5344aa5. Chain 2 (Bitcoin): anchored in block 958531 (2026-07-18T09:39:18Z), 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/QZK6F2230344.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89e06745cbe042fd2ed3f47efb46695ace2f96708aaa2ca8815ff49d4103b406. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/QZK6F2230345.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9fd1f825a377a80db9836ae150fd67bb6bb7bb618177935ff63dbf345e35f209. 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/QZK6F2230346.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14f9efdc2f7946607adcbe5babbb9c9bbd456ca4a5c26f30b541861cc1e91709. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T19:17:28Z), 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/QZK6F2230348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74a4634beb74041ce7a07ee725723ba2169582ebaf01943c08deab1a096be449. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/QZK6F2230350.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0137d4493109c300800d7c1079cde6c3600a0edf21625e955d9bd6953e7cb7ac. Chain 2 (Bitcoin): anchored in block 958955 (2026-07-21T03:03:40Z), 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/CH6542401466.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x203dfebf4805a0fb9e61fdad4ec1555dbe1a88d21cc61e99ff2be67093f3c215. 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/CH6542354907.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8893e8289494fd138dd9fe8db6fcefd4e81eb1d4224ec26698a2d8e947616c3. 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/CH6542455473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8893e8289494fd138dd9fe8db6fcefd4e81eb1d4224ec26698a2d8e947616c3. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/CH6542455473.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x325efd9cf58ff9c41f285e6e76232230e6c3489cf735ab7c4d3896b9163ecc2d. Chain 2 (Bitcoin): anchored in block 957780 (2026-07-13T00:36:44Z), 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/TCAJU2594858.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98078da88faca8c512320e11e1c7d1dc96506da2a743dca316af220acf001d83. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/QZZ7P2458403.