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 0xb54954dc94f14d519b679f94e714c7762018f0ad0c050bbd087792a7986e0ac4. 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/888bdd49-a6b6-4661-9db5-4a5dfd98fbc8.json and https://artists.proofprofile.net/proofs/artist/888bdd49-a6b6-4661-9db5-4a5dfd98fbc8.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 0x0edd338d7788920006630ea330b01e59f610266054b20cee46cb0bdd1cec81fa. Chain 2 (Bitcoin): anchored in block 959118 (2026-07-22T10:01:58Z), 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/SE62M2231216.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2c6e818dc454f5e5e3e11b465b91e8c09272fd657997efad922f99531d359cd. 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/SE6XW2223973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7964da119eae120a5e1b02c378f9c3c395133ee1086ee0b9bf9e68c62bf965ed. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/SE5752347369.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60d6f71d94f393732529a617baa4bc198ef0fcf8f7ffd8af61cb78af4f9f3e03. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE6HN2337993.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2127b38c18ea4262bf6f0ba14937d6a88268a8bf6696c7c0585dcd759ada2c8e. Chain 2 (Bitcoin): anchored in block 958493 (2026-07-18T04:34:53Z), 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/SE6QE2362403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b7f8d48541dcaee8222f041b53096d3d36cf47b34ebbce8482d6e466fbda5d7. Chain 2 (Bitcoin): anchored in block 958331 (2026-07-16T21:55:37Z), 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/SE6XW2376007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1a1c65946bb3a3f9a341f231c6b2d563d98196b9f5dd4d32f9092641e333639. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/SE6XW2347516.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2b0e96c35ac9fd8110bbc40be088bc24342f022f3f11a4f58ebe00d87ad3706. Chain 2 (Bitcoin): anchored in block 958903 (2026-07-20T15:22:45Z), 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/SE6TI2321263.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2be58df3a241ec00c6e503231565603c359f79cee13b92288453dfe672e0136a. Chain 2 (Bitcoin): anchored in block 958300 (2026-07-16T16:14:30Z), 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/SE6TI2356192.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x73f02101c56c2aef881cdacc96a826988c6d55a67764d34fb0e0f3623ca0a8c3. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/SE6SA2321866.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2281145f97139ef895dd3b36ced231cc69bbd4964a96f6fe21602cb33a58df85. 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/CHF032408299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6de86d4b7b6667c921a5bb59bcef8d506d97701f7b80e9fb668b1a4ea2b9024. Chain 2 (Bitcoin): anchored in block 958779 (2026-07-19T21:08:39Z), 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/QZHN42434087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ded47fc4b528ca5d21925f43a8bcfdb354fd4fa2689e7ca398c2670bd89758. 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/QZWFK2434967.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa11d6f8062b5fac01ae4715cbf9ac0c8b0a70a020545f8fe4eccd4b8bf2a2ed0. Chain 2 (Bitcoin): anchored in block 958153 (2026-07-15T12:03:04Z), 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/CHF032502965.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc11227f48f96aa1f8348f25df67398ce2d1af9d82c20393594acd88bbe2fe439. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/QZTB92522320.