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 0x58144bf107df39d13651dd53ab1e9fa51091163c4654400d90931b1617283c50. 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/f75034e5-ba99-4e5c-bd10-73832bc33549.json and https://artists.proofprofile.net/proofs/artist/f75034e5-ba99-4e5c-bd10-73832bc33549.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 0xfd5f7d49888890f099355a1b7e4af050e4e15b44e898c9ec874eff5c869c98e8. Chain 2 (Bitcoin): anchored in block 957782 (2026-07-13T00:52:48Z), 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/BR03D2300314.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd3cb1458d7c9d3cb8d4c03c5bc9348ce18bcac6b9e845339d6dc135730b6c8f. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/BR03D2300320.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24bf70e61f0d07df83f9d5fd4cba2871d8071d2169c295fed291565f206d39f4. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/BR03D2300327.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe131c5b62aa008e48c92a7ccfc64a489ac4b59fd3d6b01748028fa6fa2aec61c. Chain 2 (Bitcoin): anchored in block 957776 (2026-07-13T00:05:10Z), 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/BR03D2300226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff9f4cc6665a2b9322c9e6e197295d12611f09d06425eb096acd0d40befc1667. Chain 2 (Bitcoin): anchored in block 957775 (2026-07-13T00:04:23Z), 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/BR03D2300227.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb5620b83ee9782e52877e9bdc0883b5b1d839f7a3df0ca9e084b8a497700f50. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/BR03D2300228.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e24652fbd6d808102e8b6201ff886cf58a32796a5c06b4b80cfcde55aa8b89c. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/BR03D2300229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f6b626b89c539ff55797d0ff38903f044b53a34cbc346536a03d6835754ca9f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/BR03D2300232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc77f875a136ef8e4e7f748f7e6e2293838dedd9e3ad12ab25a99306b848c30d. Chain 2 (Bitcoin): anchored in block 958771 (2026-07-19T19:27:18Z), 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/BR03D2300233.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c94cb6238218f5445a3ce4b15ff1877d4286b600ab31885476e42cafc558ec2. Chain 2 (Bitcoin): anchored in block 958383 (2026-07-17T08:20:01Z), 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/BR03D2300234.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe137efba9eb2fdebad0dee0df45b3916e36bfe6ce90f4613a2334d9118decafe. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/BR03D2300235.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcc83355f68c7052db7c0c30631534019ae222bcf2b6313ed16701e42b52c46. Chain 2 (Bitcoin): anchored in block 957778 (2026-07-13T00:08:48Z), 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/BR03D2300239.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed8f8e6fa5ca2df252732ca4bbbd7c765ee2785868fd3dae74d77708bb4b3d67. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/BR03D2300240.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa42e28fc0aab57cbccea0786936b9da390e0b9e3648c9527b0dd8e9710742671. Chain 2 (Bitcoin): anchored in block 959128 (2026-07-22T12:33:25Z), 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/BR03D2300243.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xebc00123b3d39231ddeed7eefece3e85cad9a09206c1074aa9698fb4f90ca153. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/BR03D2300343.