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 0x070b2efa047717991c7267649ef259085099c5f2c8c1d343fd37b88c3e3a08c3. 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/47b0f85b-8723-4460-9a1b-19e868bc4f7e.json and https://artists.proofprofile.net/proofs/artist/47b0f85b-8723-4460-9a1b-19e868bc4f7e.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 0xa574b71d2c4cd3f50ceda828387248da745db23c4a9e05edfe22a0f22d070559. 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/TWFF72200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb7f0cceb0ba384149d7630ee55b71746ba3214f18a8222ff30e41f0451eabbe9. 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/TWFF72200006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6871795cfdf62473800b7996f95dca9f56d9486e535cde1f806246ac58233fd. 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/TWFF72200008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x935a014159a980e5b1632916c67931513f2242798876f7f0f09a9af6b016d2c9. 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/TWFF72200010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4d7d314f1216b22387c6a3015a23073c2e7e7aeebd4083562255269ca411c5c1. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/TWFF72200011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf37effecc8b322ff7af9f1cc1cdf545d9e25e974df260987874712cb09d245d8. 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/TWDK52223049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe02bb9099e5eb97f5fbef27ef3ab27f96ac53faf3ec5714ca2bf57f3ac1e5929. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/TWDK52223003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe52d55bfb3a336f1a723db366606b8c9850bd2752379b89e16bee56a940af7cc. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T20:28:42Z), 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/TWEX52190204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b6036d8316bd82161e83e1d4de4681e6002b6fa2adb917ed730be16bfb4afa9. 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/TWFF72400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71d6492d5c3aef30aa499f198af1fb24b2d1f591a2d43fd77a3639937d15a327. 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/TWFF72400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a082a1cf486459c9f2755cc0d48caa4995d7e116c3ac17ea583f5d278ed1e8d. 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/TWFF72400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4a61d23548fc5b0af4bb03740942d37c13df055918edc4956ff935d346094f4. 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/TWFF72400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef412c5b22a76c7e5d1208a03f59e33793b142768abd7a6aca94b6f0355d0963. 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/TWFF72400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x74628110476edba28f87232b8e1058e9d70c6ef2f285147adc810bb74eb52b84. 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/TWFF72400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0c934f7f60d8ecdf0f56c532e04012dd96627e0e343e39c5a645e4d5286eff3. 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/TWFF72400007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec46e6faa83d0a1653289e1cc87e37cab979785f33beda98d60cc8828f57cec6. 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/TWFF72400008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9ed39a54f2bf4e41140a21eb84042786001d9e7119eb3f75946a03385b86708. 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/TWFF72400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x57b9cb84a62b40f825d4b513462d1b872648bd840a93f99c4652e5e4e375988a. 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/TWFF72400010.