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 0xfe4ed7b23e04bbee0c4a64ee6948db5f86598fdf19908474f679cfcc58198729. 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/21c3a5a1-88e9-40ec-a7df-ae3eb00ea4ec.json and https://artists.proofprofile.net/proofs/artist/21c3a5a1-88e9-40ec-a7df-ae3eb00ea4ec.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 0x3e4f52aa93b3f92076b1d784c854fe3c98d131b0f5d3cbb7a683ff27ba716896. 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/CA5KR2380062.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a12c6e08dfd850f68a32ee9d843cd1bfedf78e0241ddc8e4bd6fdc31c852912. 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/QZMEM2306690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb3d712b43a81eca8b705576ba37a33c917701c4356dbead65f4287b78120f54. 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/CA5KR2354415.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x882738da7698bcdb7c135a7f36867dc8e2597539e70be44281c4169e2c87d42f. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T17:27:19Z), 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/QZTGW2401459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2d3e885955bceb966a10ec260c83672bb17cb407b78942f86313045a90086bd. 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/QZTGW2401460.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a8895d2e5776f3dc3cc97a89dbde46fad20b9871262e7a4085b6e52f4f01286. 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/QZTGW2400808.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7754f03b274be2b6963eb979a4b2460207d8e776bd16905dd90d17936dc2eaa5. 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/QZTGW2401154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf17efff915bd25970c56c7d6bf37ead48cd6cdf87cceb8ccecc0f303e9506582. 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/QZTGW2400219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2bc83e67a721994d5c1394a9920048e39ced75f5fc1063d42978cffe7a782f. 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/CA5KR2485246.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3172a7a35a7d292a93b41cfaa45dd66c99dff2b48d1f697224555296c0fc0913. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:41:02Z), 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/CA5KR2472304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad78a43aea12da62970f9e5d47bc01d95e94ca5f8adb5ae2457b1859ecc7cdb1. 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/CA5KR2475352.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x490d3de25bfbe0f16eadf557768517b89291fb23ff44de262f5459135352655d. 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/QZNWX2443866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd9ccec0325d7bdfc449beeb770335b13de5b4da8f7d734c10005d237585ba6c. 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/USUYG1548826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6de5ad547cf254697e15d654464e6c7dc0920fe48f08a3b8cec8eee35327602b. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/QZFYX2441757.