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 0x18290e8225f4fe45b7d2932a6e1786e816645f5ad12a75db890d123b4a6f031f. 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/85bd319e-47a5-4963-83ea-ffcd14b27ba1.json and https://artists.proofprofile.net/proofs/artist/85bd319e-47a5-4963-83ea-ffcd14b27ba1.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 0x903eddc6abfe193c297d0611da92bc4388368516b0d94460b435ac8770c8b416. Chain 2 (Bitcoin): anchored in block 958992 (2026-07-21T10:12:17Z), 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/QZTAT2117543.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x140ea46d8c35a4c4529979230f6f71c318b4cc54cbd60a47e133d58847be22cb. 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/QZRP42256465.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c9459965887f824b5a54b697d24cd75330ca058869938198033a0227cb9f78. Chain 2 (Bitcoin): anchored in block 959094 (2026-07-22T03:33:16Z), 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/QZES72354916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55c9459965887f824b5a54b697d24cd75330ca058869938198033a0227cb9f78. Chain 2 (Bitcoin): anchored in block 958506 (2026-07-18T06:14:51Z), 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/QZES72354916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc67b010d4c3269f940804cefb18348f65dfe660a96bbb18ba60fac9993cf4c4f. Chain 2 (Bitcoin): anchored in block 958342 (2026-07-17T01:09:53Z), 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/FRD0K2302120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6d298f9ba84220f9c71c4330409337532a37df58ce290bf6b30f9c38d6bc066. 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/FRD0K2302100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc89e2ef069936702b9bee0bfc2d48c0c4c256c0be9f3153adf6404630ef312bb. Chain 2 (Bitcoin): anchored in block 958596 (2026-07-18T18:42:38Z), 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/FRD0K2403610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaab17d4d9d374a84ffa14e179e6188f77f529d4736db8b5568d34d1cfd2a4ed. 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/FRD0K2404280.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc327fb178ab25c4afb3566998fd448c2df2b17be9b830da54f574fc93d18979. 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/FRD0K2404170.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba473313d5cc1937d665bc6a6e70d33bb33779b650080fdbd09c01568980920f. 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/FRD0K2404290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0339e16131d4c20b9cd779aeaf00744bbc697836e4c3f6adc4d7e2e284e34e8d. 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/FRD0K2404640.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe455f908edb21e6c6cfbde2b4ae22d81d432ab62a1d026ee170086967cd8348. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/FRD0K2404650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x758b90c1674fced353161994de1bbe1a84e654d725bd304feebaa955cfd141ce. 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/FRD0K2404690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55cab0298b1cb2507d923c518e009aa8cafbed51e945d92c8c1ba3cdc454dade. Chain 2 (Bitcoin): anchored in block 958146 (2026-07-15T10:33:22Z), 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/FRD0K2404720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0952e68149a2d249c89051c14e58cc1c2411d53a7e1797876654487ba7e7b61a. 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/FRD0K2404740.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x55119a11f71c1ef732df05fc0305a4b9f6a12f4ddcbe0aa617da402fb46c7892. Chain 2 (Bitcoin): anchored in block 956551 (2026-07-03T21:18:05Z), 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/FRD0K2404760.