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 0x4d7bccaf6c0b3945da81bb9e8026162ee016aab1fae01f9712390afd9f90c293. Chain 2 (Bitcoin): anchored in block 953791 (2026-06-15T13:40:30Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/dca8ea72-8d46-4a3f-99a6-1c99c771f2d9.json and https://artists.proofprofile.net/proofs/artist/dca8ea72-8d46-4a3f-99a6-1c99c771f2d9.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 0x68161aefc67acd741d3175276b9494b8c0092b268bf2e7fb0d0d39e8a5904986. 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/CAENV2443413.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd3bb584347665189470117555e9d9c5a249624cb84e43b2c7041e42c59278f17. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/CAENV2443417.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2aac0bb03126792be1dab3da4a6e4eec06d82293c5d20e18bef11c630dfa57f. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/CAENV2539916.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7894bb523d7adbd5bc3b5bee9f44c49b7b177eb55c3c77da720d9a06e7d44239. 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/CAENV2542254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x680f29a2384b7bcba9f85e9c439a3b7fdfd9beb9508b9e9ef62f96648bdcc649. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/CAGOO2523687.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2f8740da68bf7d8252c3f2194c2acc4c10c31837389caef11b2441bbd1452a6c. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CAGOO2523695.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1a58d9ed3016b2a29c2f24cd6b598222a7b9fbffac693ff1971c053a5a9b6b. 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/CAGOO2523692.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x95ce7c1ce48d4bb1185566efa51a1bcb9b5e39f62abdd75f786c3974ee90f0fa. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAGOO2523685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf950b175d6e2936db11c50ee19497eba7b206ca44c9d090fcda8ddd39248213. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/CAGOO2523682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x770d044b5c240fdabef99563bcda9b0bd0be19b16f91d6ac2a98470e48a906ed. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/CAGOO2523689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ae2ddc7b2b9c15d6c3d632d14ce2e0b01c8e22e9e873535ba7d3cc593d754f5. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/CAGOO2523677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x502a88e3676fb50b16320551a06faa250fec665da2170c38796f52e67c391d7e. Chain 2 (Bitcoin): anchored in block 958873 (2026-07-20T11:48:10Z), 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/CAGOO2523694.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd7fb8836f9f9d614192965e381e264c82759935ab6104a9736b8f2ea5c2d914. Chain 2 (Bitcoin): anchored in block 959137 (2026-07-22T14:03:35Z), 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/CAGOO2523690.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49201a739564c334aed4a6945cd3f06907765dbcad128f37720a0db83e829fc1. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/CAGOO2523680.