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 0xf5f45121ce48c5ebf2801b4673cfc5c536c164e792691e5295a6750538b421d6. 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/a82cd430-a3e3-4f75-8ea6-e86dba1f6158.json and https://artists.proofprofile.net/proofs/artist/a82cd430-a3e3-4f75-8ea6-e86dba1f6158.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 0x387bbb262f9eb6ef2aef32b7fb5471650d7c90cdd1e0380db967025c9f02ae85. 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/USA2P2400287.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5e898d7ce1aac2c1953515d3d1fb0c8a0471a9e143d052609e477e509e43706. 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/CAQOI2402805.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x475ddc9388beb4bea72f7dd496299806ce649494c5ffa1ce5deba204a5cd94ca. 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/CAQOI2412111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcea537e844852c53ec9c149a515c6cebfc1053208fefbabcde93ec17b3004055. 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/CAQOI2412110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ef123185e986977eca811b1b3be834cff1407aa7bf424e005495387fe407dcb. 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/CAQOI2305757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2eba2fb26fd09571580d5b209b2df3a471b7935247600b7efb7c4038a633024. 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/US3GD4453298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17225d27b17d17cff54c88f2512afc4e885bfd01a3a99b34dc4c95dc5c1054e5. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NL3NM2000083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6525bd868d78f527dc47156dacf15410f2a57eb9e8c13f7c7f5aa55b3f1b10b. 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/NLRD52302416.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f390b4fa5f284addb71afc5b7312a781c898ddfa81ecc7430e72bf2f464dd54. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NLRD52302417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3475fc402afb59498d8c446165e5894a5788fe14ae7445407020f3454bfb392b. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/NLRD52302418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79a7efd152246909533c63f997b45b5e50f20210e00da5ae3aacc7917ac288c. 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/NLRD52302419.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe27984ea26be6b8e75f5e28580e31e269ca0e9b180a55df5c507831ee02e2415. Chain 2 (Bitcoin): anchored in block 960200 (2026-07-30T02:37:10Z), 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/NLRD52302420.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c1af646896457aeb968591343c21da34770dc48f33402d34516dce4d5c2f223. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/NLRD52302421.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25f8ea848c9ea1fb559c03beac4c475456e49931f3fa2913d81450d5ed9c4998. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/NLRD52302423.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56aa36f8198f14031d716132b8c065ca410c6d65789c04c0f4916a4ea24cf913. 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/GBKQU2327034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c82a8e34db6cd362acd0a99bf04ec59620135bf39f51fc8d84602dfb6460d6f. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/QZWDD2216296.