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 0xbac11cbe405174ab404e93abd05a8565b061b3023d7125a01b097d899f7b9542. 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/ea9ebfed-ec98-401f-ad53-3b051bf03762.json and https://artists.proofprofile.net/proofs/artist/ea9ebfed-ec98-401f-ad53-3b051bf03762.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 0xbb6a4bfb1b4122a683a86927e88ec85f3b1cb9c5b47b3477deee9fbe6c85a6ca. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG662400396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65eb9e44052f9984898ce3d17cf69b5ab8b8b131252bf4fd7d38d98bab73c1b. 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/NLG662400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d33e256a0c603a6f21e74e136a96d7140662550d03a736f73a2bf30d6f5e400. 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/NLG662400161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7ea58788b074086e0fce867513b5b41029a3221975accf97ca29e56351336b. 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/NLG662400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x198639e200aebe7fc3ed4d58893f252ef761e8b144a6b33894485d78c9603826. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NL6JV2200050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65eb9e44052f9984898ce3d17cf69b5ab8b8b131252bf4fd7d38d98bab73c1b. 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/NLG662400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe38c05e387dbe4cba8f78a1cb994175e3d812782ee7b78941434eda1fe0826ec. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG662400218.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf8a26882b006b10cf0ce447468172b7d6c8b55bd7a670d74681cc4f68bb210a. 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/NLG662400219.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d33e256a0c603a6f21e74e136a96d7140662550d03a736f73a2bf30d6f5e400. 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/NLG662400161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d33e256a0c603a6f21e74e136a96d7140662550d03a736f73a2bf30d6f5e400. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG662400161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7ea58788b074086e0fce867513b5b41029a3221975accf97ca29e56351336b. Chain 2 (Bitcoin): anchored in block 954130 (2026-06-17T19:07:14Z), 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/NLG662400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x01da4980a0f74b7c56f5c207492a9e154d70bb0c169ebe86baaa2f1eb419a2fd. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/NLG662500103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb6a4bfb1b4122a683a86927e88ec85f3b1cb9c5b47b3477deee9fbe6c85a6ca. 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/NLG662400396.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd65eb9e44052f9984898ce3d17cf69b5ab8b8b131252bf4fd7d38d98bab73c1b. 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/NLG662400248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d33e256a0c603a6f21e74e136a96d7140662550d03a736f73a2bf30d6f5e400. 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/NLG662400161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xde7ea58788b074086e0fce867513b5b41029a3221975accf97ca29e56351336b. 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/NLG662400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x653229cda101df370db37aa03004932be89e79bcc294a41b311387a915965ff4. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QZNWQ2254878.