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 0x35c092501e63ee3eaef7553d2c4482f8689f64f038133bea9870a4d35884f51e. 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/8ecb80a2-d92c-4be5-b777-8594152ea219.json and https://artists.proofprofile.net/proofs/artist/8ecb80a2-d92c-4be5-b777-8594152ea219.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 0x0e17a64b5bc872c8799ac1ea95a03aa7a8ca88f6857e6dc29b46ac1af86b13a3. 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/IDA431808123.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8a5d521cbd63ffdc4f1c9e013ad70ac23b8ea3e2b74ab572b2d8e8e290b42042. Chain 2 (Bitcoin): anchored in block 958690 (2026-07-19T07:14:39Z), 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/IDA431808129.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb9e7d99a18656b615056cd2cfd0b1d189626c1d06020ccb04233090eb5635a02. 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/IDA431808131.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf94c31dec48b5d9072d9f087b1aa9d19118128e482ff391a96506448a8945d8c. Chain 2 (Bitcoin): anchored in block 959073 (2026-07-21T23:25:37Z), 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/IDA431808137.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e884642b46b58f9963c10050a699d6f5841881d73d28adb5fb951a056075253. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IDA250900402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x165bc58d26a8bd82ca09f23be05f923916f48c0e80628516206f4bd1ada9ba58. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/IDA250900403.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa400febdd1952a3ada315b5bcc01b3bcae607fc94cdaaf788020cd6badf11011. Chain 2 (Bitcoin): anchored in block 958245 (2026-07-16T05:50:22Z), 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/IDA250900404.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdae4411cdcd2f9f67cf1243a3625b618458a1942cb8adb5b72656b9bbcefc284. 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/IDA250900405.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88e39610835362c25e3a086c8af48a8af464fbd3880a33815dddbef003847efe. Chain 2 (Bitcoin): anchored in block 957695 (2026-07-12T11:16:12Z), 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/IDA250900407.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfbdd95601c13d06f0a9af85ad198a4314a6b18ad20aae9d2dfffdbd122968c69. Chain 2 (Bitcoin): anchored in block 956404 (2026-07-02T22:12:38Z), 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/IDA250900409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b766f2b5eb999f6b8d2fe859f31b8a8eb610e531c7bbccae01ef5475594a739. Chain 2 (Bitcoin): anchored in block 958067 (2026-07-14T21:26:15Z), 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/FRX762224698.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ca4ec44b91c0fa447a25421bb598e155b610787f7b1874a681ef0e06404bb6b. Chain 2 (Bitcoin): anchored in block 959051 (2026-07-21T19:48:03Z), 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/FRX762224699.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x22110b0765717ee796b6a29dbbb921ed31baa1f4d8961e9503eb00c524b7b377. 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/FRX762224708.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3442694f3bad835efcdbbdf218e49edc5a24cf470abc4c72a27a79256ada16ee. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/FRX202055676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe871a9a46115551efe452fa3290d4461baf0c32407f56842db8d12b37ef9616. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/DGA0P2460959.