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 0x711ca18cd6e242b9af1c5670a53065ade915d879fc45248d6ba0695876fa8ae2. 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/789080b5-4b3c-447d-85f4-803f1f1935a1.json and https://artists.proofprofile.net/proofs/artist/789080b5-4b3c-447d-85f4-803f1f1935a1.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 0xed6c4699feec3271d99bf0163a5b3a96c79889852088b5da7f21079323c12578. 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/BCQAL2200014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdb3a8a80cd126df4254c581b2f6922866f874d4cefa6798a7b8a628301c30a8. 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/BCQAL2200013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x467141a34edda2c56a51cea350bcf179cc160b223c327b1bcf7164e35f292897. 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/BCQAL2100014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x51489c799841cda8d488894c4990b1e30b2cfccd18f3937691ee2ecc67ba6305. 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/BCQAL2100002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbde42ad17dc53d1c9c0c1038300ac12d0ecd7990b4642a1e0b45d185484f5c. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BCQAL2100004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x286d21998c7aae9e0e62deae839f52498b0326bb6834e1531cc5ae39926835b3. 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/BCQAL2100022.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62d37d4bcd395d83fb64104b12e850474b12984b5b24a842fe9fc14539094172. 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/BCQAL2100023.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee45d67df20bf70e1493526ceb2fc241bf9473893429eb7f23f4f75970c8d450. 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/BCQAL2100024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba2e1171a84060e39d243d16496bb5bdc4e72a63c35952acbcdb3223ce98d9e7. 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/BCQAL2200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5326b146f1e512d09e0026a8e18269e496bb71d2fb2abf6662841f495e8657aa. 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/BCQAL2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe40e014ce2e6400337fa7dd0152c7a8c52eb588e460e2da785ec810fb83ae7ec. Chain 2 (Bitcoin): anchored in block 960117 (2026-07-29T14:28:24Z), 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/BCQAL2100005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x778c848a3c5c50c1054a10ae5e53f9d1d71252bafb5216c3ac3ee547a99a6963. 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/BCQAL2100006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98473979b701145c0477fc14519df24836c2d4d2eafa58ff5a97e2b3aed0c9e7. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/BCQAL2100007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49b1a44c97b60ff7603572a57483f8b2950c7c2edcde72602089f81ce9857f5c. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/BCQAL2100008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x40a8802fcb5cda72fa34505a662bd0f235e832edf3cf8136318655fd165893e0. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/BCQAL2100009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4deef333d2962ddc970f6800cfd5eba20346864f6aede291005533d41b8b5a9f. 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/BCQAL2100010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd53e96385f4601cb43402d10282ddb2b352c635b436b4f038d21d5aa9df0c435. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BCQAL2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x616b0ca60fb0412969fa003b0bd32d4ba9d0989868f11acadcb245a6175295b0. 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/BCQAL2100003.