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 0xdc399320b6c126493db67cd15c98a81bdeeab7b6f47ee0cd83b9590053d26458. Chain 2 (Bitcoin): anchored in block 953633 (2026-06-14T12:47:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/35a80246-4784-4b79-8d4c-7d03636ea23b.json and https://artists.proofprofile.net/proofs/artist/35a80246-4784-4b79-8d4c-7d03636ea23b.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 0x5ac5d76017d03e75f2c7f30c43a2eba28e834df062b2b78350afeabef9212a58. 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/BRFPK1700001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a127638ca442f92de28ae243ebbad05c4b1eb54fd8283ec994f342c22aa4579. 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/BRFPK1700002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e6907eaa2dea1651211581658a2c91d26c25ce985f9fea44fa82be792b44927. 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/BRFPK1700003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb871a91a330b65c63ebf47e5ad26c9afdf5c8f18441bd9ed70700f9ec0eb3081. 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/BRFPK1700004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc95db47f5a377199fd6866016ed2af7265246e4ceca76546a7629bbd807148e. 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/BRFPK1700005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb21c9865bb2f62dbb9cbc5e2c3c6774cdcc812ff9cbd231b726140957d31f0b. 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/BRFPK1700006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca12d615b53a05bb2be78e3d78dc5aa9274f4ee192c3620ac91b37c8c3256a9. 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/BRFPK1700007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0f578de28bd853f9699deb4f83d1ea6eceae14525f61cd02261bb126b9a7a42. 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/BRFPK1700008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeef45be9cae713056580159a95fcbeb03239323a56199100460aa9967c6a9ee. 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/BRFPK2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbeef45be9cae713056580159a95fcbeb03239323a56199100460aa9967c6a9ee. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/BRFPK2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x14bb1126d914d148d87a1d0622b1b915adc073ab2d72e979e8e8b0979f15b886. 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/BRFPK2500004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed646cbaf8eb26282362f68eec6a6e8805d3db1f949a52ee203d3343dfc901b1. 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/BRFPK2500005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x991d23d5d40e236cd3337cd28c9ef22a797ca64480414ca8a6e83030da2d30ac. 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/BRFPK2500001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d6a6fe19c0881bff9a78e2373235247a8304ba1181b337d89ffad0a6914c417. Chain 2 (Bitcoin): anchored in block 958335 (2026-07-16T22:37:47Z), 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/BRFPK2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb4afe942ded32e174e0f0c1428f5b19e99855109e7f19745980e4819bf291a4b. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T20:26:34Z), 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/BRFPK2500006.