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 0x34f9be4b9bf6ed23400dd9a37b4953a523d49976f7204ef4ba8d187fd11c9d60. 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/ea2a1829-0bc7-4f89-ae24-c87b2c121620.json and https://artists.proofprofile.net/proofs/artist/ea2a1829-0bc7-4f89-ae24-c87b2c121620.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 0xa2fccc9c59288614eeecd5fd7e43c6c11c73ddf541e5de2faf8620a2abe2a21e. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/US6RC0900001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6bbe5230437584d40a11d1593329f97d3c46676643d1800aa23d16d3d8eafebc. 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/USTC70860335.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc72ea8e92fb459b4e6eaf557c3d5842fe788025d8dbc352de39965dd07582b6. 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/USTC70860360.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83bfd95707b9a8b0ff1995294694909d29b3fd26547c6ca51cb99f5da98d1b92. 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/USTC70860394.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb9fca6f68b5afbf4cefd120cd0455ef8413ac4e2cc2ec3374487a557dcfba81. 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/USTC70860377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb44495c44822c2e4419eb49f200b6d72c03c71d1cbe4220225e765b10a0a84a5. 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/US6RC0900002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7066b75a364d46e7e6bbdf427ff301f3b8301ce2d12313f4cfd99714c38fa2ab. 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/US6RC0900003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3944dbbd00239f7bc7d9f23aed8a5b2a8bad62b5638edfe07c992694e5f58133. 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/USTC70860364.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x53b6b6e1a241ec68ca608205442b74afb6343feae123ef9a52cca4b2fd77a363. 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/US6RC0900004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0aa9ec4f209238348e14027e69668b1d3bfd2495800a1f66b775a99bde35f025. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/US6RC0900005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x38b6eef6366fc355fbd56cb72cf6cf2865927066b6662f684af35ef773312269. 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/US6RC0900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a14484765072d54debaddc47bdda22102dde382ea71ec114ba17179d05a9c41. Chain 2 (Bitcoin): anchored in block 960177 (2026-07-30T00:21:01Z), 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/QZS632353777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5de56d6e523faae1370e6606a35f849dc5276735e6764a21637b2549cd52af9a. 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/USHM21134546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2d6b05a943a0acf05f94f074fc7df45669c808d021196e0eb5f3b6757dc4b232. 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/USHM21122603.