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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd408a88111ba311ec19cb036b94ccc956e701911367766ee95183fd89c4da7ed. 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/fd47a50f-9320-4111-9c8c-96a6d9be7b3d.json and https://artists.proofprofile.net/proofs/artist/fd47a50f-9320-4111-9c8c-96a6d9be7b3d.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6995ee74394932336c3ab1a046bd8ae277fd12d6e91470ddd41d6f039f7f0cd0. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T23:56:07Z), 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/FR96X1684760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54d9c14a8474d4d2839b4ed4e79c83c17f2cc567d3a0ce00bd3d740532304b9d. Chain 2 (Bitcoin): anchored in block 958415 (2026-07-17T12:50:13Z), 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/FR96X1684761.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b83bba98ffcf38196641d153af05cf610a263d968a1294a3eea5b7f3aa04f2. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/FR96X1769532.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b89bd09405c780b7c7257f3b7cecdc5c79238ecf120f8d98764b21074c72626. 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/CA5KR1946954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e0c7ba3c50b98a72e13531ef4c3a118a184deda34f6e7291e4381158216cac. 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/CA5KR1946956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5fa2272e258524a360af260ab039e51696a31d00f9c290752c154ace59f0b5. 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/CA5KR2099380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x61e0c7ba3c50b98a72e13531ef4c3a118a184deda34f6e7291e4381158216cac. 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/CA5KR1946956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6b89bd09405c780b7c7257f3b7cecdc5c79238ecf120f8d98764b21074c72626. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/CA5KR1946954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc436d3baf2da5ecf185b9561aa74e62368dc43264cf02a9aebbf25167e5d7072. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/CA5KR1822152.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0375d655b69fc07a6344020dfdb30b9c9adcd694ef915c209000c7c10057592. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/FR96X1612096.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f5fa2272e258524a360af260ab039e51696a31d00f9c290752c154ace59f0b5. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/CA5KR2099380.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe082eb02a01b42d954ec71db6a74e5460b09ea86d8689d483605583f78e498d2. 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/CA5KR1569877.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0375d655b69fc07a6344020dfdb30b9c9adcd694ef915c209000c7c10057592. 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/FR96X1612096.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x925bc60245d51c3a3a1cbfa55040b8952bf31bd77ce6e89723511237747b29b8. 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/CA5KR0033297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7f7e68fd4d1ebcd9f29196d0a17f5bda940dff8ee20a7fa86cbfe04ed6fe7ef4. 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/CA5KR2099398.
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