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 0xd9c9500c7c7887f2895edb7282f56c713686bdb0da2f7c8fad67bbc9b1d203fb. 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/435b8834-62d2-463b-b2b7-8f9e54648548.json and https://artists.proofprofile.net/proofs/artist/435b8834-62d2-463b-b2b7-8f9e54648548.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 0x030400b044a3d28791bfe2c765f84134b6df3c6803393d34d079a2b7380153e7. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZWFQ2419017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53765a4f5ba1ed857ec5842b1a3dca002ae293fe2c94f2577a535ec87b47688c. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/QZWFQ2419018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc40901930aad5252ef7fb334f11630922a45c8c77f2bfd263e546ce74ecf6fef. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZWFQ2419019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d4f4ce1875c6aed2361f3b022e389d58b6cc88d2356efd28333c8b4f5844281. 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/QZTBD2476785.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d4f2ba027aed1df3acc7dfb8a27d27f8c12aec3c30bc2641dc5329d3155501f. 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/QZTBD2476787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5ceeea1b90cb65f7ecfb8346231aa283f0a58a1a601a2bcdbf44b141ad9dda. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/QZK6N2420560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f3d9229a55873f517b673f64d6998ec8972234b9ca2190e49a2d3ed73d3331. Chain 2 (Bitcoin): anchored in block 960485 (2026-08-01T00:10:46Z), 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/QZMEM2462723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13c718f9dc04b3bd5309faf3fb75b1fa48e51a6920a59da4184bc9a50a03044a. 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/QZPLS2407057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43f3d9229a55873f517b673f64d6998ec8972234b9ca2190e49a2d3ed73d3331. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/QZMEM2462723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f5ceeea1b90cb65f7ecfb8346231aa283f0a58a1a601a2bcdbf44b141ad9dda. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZK6N2420560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589a7e90ac36674423fb8ebc67a34804f8069060a263976621271b09ce222982. 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/QZTAT2379750.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd39559d2d1f39245420d8ff3a6771620c80464ddf050a445b5b49fbbc66df47. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAHD2374301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dacf5f6aadbf0ca07565699b861db02ae806a7919882ebd8b73bfed24a578b. Chain 2 (Bitcoin): anchored in block 960241 (2026-07-30T09:58:01Z), 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/TCAHB2374903.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e69be3d476b981678333ad1a53d319d7ceae2bdee200272c5b8f6cd4942f4e. 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/TCAGK2276262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9507667094109652cdbcb9d3330fa2c43fe53e774aaf10fc48be35221ef3a78f. 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/TCAGO2269271.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x30e69be3d476b981678333ad1a53d319d7ceae2bdee200272c5b8f6cd4942f4e. 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/TCAGK2276262.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x241256a5d0cebb3802c5fbe5fb44f53b4076c6414349e85c8667cc7f52545b95. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/TCAGA2220334.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1108761ee813f763aa3237bb2b45f004aa1c9e97475f8096dbdbc3256fcab192. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/USHM82178290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f82c06e625b48ff258a716548559234c54bb84f5d979931818ae5363506c743. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/USHM82178293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x589187d431d486b2775ac4ef4219f712c9f1b57db6c730f35730a09e88839e21. 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/QZTB32493790.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5726b9e313bf106fabe0f55b7a5d62afcd23cb23c85935543fe2bfa9355c5ec1. Chain 2 (Bitcoin): anchored in block 960155 (2026-07-29T22:13:32Z), 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/QZZ7X2475824.