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 0x204252a2533751d7285413c0e52f6b3cf5c12f32757ebffced9d3f4927259200. Chain 2 (Bitcoin): anchored in block 954065 (2026-06-17T08:10:43Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4f68d619-d735-40ec-b452-727f68b27fa4.json and https://artists.proofprofile.net/proofs/artist/4f68d619-d735-40ec-b452-727f68b27fa4.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 0xe81cae9ab79022031cbe159ae29838f3243e26f5ddb8d0bc9a68e613427199a3. 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/FRX201950173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81bfd991972ffafedb0cbc462b5b54d87e19f7a85c43654e4aef5f7161813865. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/HKD012291179.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f2271bb275a56048ba00073f6e0922f852cc714c9b077f5e50d5a2d0131dcc3. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKD012291181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x915dba5e353d6451c6007290824487fae03814edc943476691288978c308f91c. 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/HKD012291183.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ac3c6a6825ab1cc6d92472cb0f30ec3e1c77fb8a23e639b3e11da55e7f3c303. 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/HKD012291185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d00fbb43a16ec491b399eccf94370b94e9dd297da6d51aedccf57c6a959c51. 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/HKD012291187.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5d08b3505219c5a34e5b265776af6df47652f77ccb3ac33121f5faad0fd0322a. 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/HKD012293115.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x892b6e87226dbaa095c3c85760ecd7fb689a53a276b0306873749bfae5c193cb. 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/HKD012293117.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7304c5f2898bf8a2c7b4f1c9759e5644e1aee2adc404678056b1337ad75f882e. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/HKD012293118.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x597e1925385bc33482da4a1790c904e7b7a528dcb4444c4156c328e6c531ed8d. 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/HKD012293290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89fbaeb163cb44d9b9a705e95c3131853a8a7f42122dd8098fd92ac4441d83ab. 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/HKD012293293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf1df8e60a79b57e927413d7047691697406da3297d67a763dd91efebacd16e32. 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/HKD012293294.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf977ff0049bbd24b4cf6a2e3469b12c3e94e6ee3550eb23b885ca6dc3efee05. 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/HKD012291180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05a9e5578fcbb4dddb9eef7f8340606a057a8d2522fe43b2a9b2794da2bec1bc. 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/HKD012291182.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d867f52fb4e9ccf87bed028bbe9b838cba153089ebf9e34595e0c0c0b6876a0. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/HKD012291184.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa010730e30a5b6ad5521c5734f0b552af95b9039fb06ae2b4280aa1e837dc9cd. Chain 2 (Bitcoin): anchored in block 960497 (2026-08-01T02:22:04Z), 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/HKD012291186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48a3bf2739be01ffee3c570c7d86143efdad3baf9c334b08f08de23dd610f8ec. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/HKD012291188.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8b3f2e86b741bd529da0c403c4cadd0f6af4d8991cd3fe51f70665f2df2c106. 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/HKD012293114.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd136f1f6326f7c13e24fc2c00535533045f041a2af8218abad59ca328ce7ce2. 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/HKD012293116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x656756d572f6917bafb2ecc49dc9576c0333502257832b5ef04fe52b6a71c2e5. 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/HKD012293119.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3972b900d0d9a4ee7e578e5fffaa40a25394732b057b8add0984a2332c3be3bb. Chain 2 (Bitcoin): anchored in block 960410 (2026-07-31T13:50:38Z), 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/HKD012293292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed51e9ee65f4e9491a59dc7f1a2a94db80e206119b866a45a02b882150782ab0. 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/HKD012293295.