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 0x3981838faa4299c0462b86adc1250cca1c49f370fbe331067fe1a3c39a5ccc9d. 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/9e2f3d01-7a65-4572-92ec-8e50e8096383.json and https://artists.proofprofile.net/proofs/artist/9e2f3d01-7a65-4572-92ec-8e50e8096383.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 0x3be73a40b68febca87770304be763dd2e78e938ce6f6e643464e1f3efed985a7. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/NLRD52410484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7faad618228b8dfbd652fcd1b8e8928bcfd9554da226b367901d259df734d5bd. 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/NLRD52410483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x90abe777d5c8f7e843329db257a79b6f51018f8c0dd00fcae26bef7139e9bf18. 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/NLRD52410485.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x073307c496595ad95e760b505a0f5886609fe80d43ce61e4ff801048a8eb33e6. 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/NLRD52410486.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05f24d10d13cfbc80d5c2f21a20e7357be2d7521d59526d30b9ab4d8d18c7970. 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/NLRD52410487.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x64fae1a04a8885d8e14ce7b81c0bc7af12e24ae33e7ff2f333698cc45bd420ff. 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/NLRD52404641.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x82509e9fcbb3ab3a25fde475c954deba229a325503aad87fa7e2094cddb01690. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/NLRD52265507.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x31dc5a3ca252f44eb9d911fb4afd106e961377e2ea63f24f86525baddd2ccc7e. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/NLRD52265504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb246bb8629a0b9b139c1dcf3aeb096453a253b8816a7256812aaf765e06975af. 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/NLRD52265500.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c43502268f83242e9a484e064fadb557eaf1f028d2621cabd72d52dabbdbba3. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLRD52265505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5372b74022d5d23e8f675b63f51f31e7a4f746d1aa9cb613e352d1f011e8a1. Chain 2 (Bitcoin): anchored in block 959155 (2026-07-22T16:43:41Z), 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/NLRD52265506.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe54ccfd8240dfb4ac6d840fe20c7f486766d58f818c27697510e921ca913eb5. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/QZZ8A2366570.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5cf941ede1923c30a1c5bf2065cfe0dd20b85a3d174105350dd6fbe657356bf. 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/NLRD52325160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef22d6002706a415cf955938d9229bfc2246fe14c94f3185f51550fb2ed7822c. Chain 2 (Bitcoin): anchored in block 960209 (2026-07-30T05:15:54Z), 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/NLRD52324675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4bf47dfd809a5584f3864fe9e9d8c7b6f279f1b9d73270d491841f9eb6360f4. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/NLRD52324677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde5f7d2922ede8555292a370f069ba9ca30ec591e90f54c755420980b5433b09. Chain 2 (Bitcoin): anchored in block 960503 (2026-08-01T03:41:24Z), 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/NLRD52324676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6512156eaabeceb2b6709b425da2b24159326689c9498172577385425bb803a0. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZHNC2393775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e4499d168fa8e79a0ce58130b867abfa09ccb44870687c0c3ecceda784e6e52. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/USCGJ2307717.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xef2fbb643a448b86a18dc544727ce5d0fe0ea0070b3c393ed2867b958bc9b1e6. Chain 2 (Bitcoin): anchored in block 960407 (2026-07-31T13:26:30Z), 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/QZTB32297821.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xacd82cd273cd3152c7191d54006f0f8d98d40082cf98290b9ace2c96001529ee. 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/SE6XX2253160.