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 0x43902e64cd0b0b9e8364f79e2ca927219c9b380c1eafdfd1038508bbb7bd3d5d. 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/39c1f988-63b1-4f79-8d75-b03f2d40cfba.json and https://artists.proofprofile.net/proofs/artist/39c1f988-63b1-4f79-8d75-b03f2d40cfba.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 0x2a77029583648e0f74e72d4d47cd4696904067c65f0334b882d75e1b70b23756. 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/QZGLS2062459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04897000ada92a25aa146ae80f098daec969db40990da59cd3170394a4f7a163. 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/ARKW52000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6fbd53810503ce09120f1014b0e055604d7bd02439fa838ecc2be02e6fcf52. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/ARKW52000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04897000ada92a25aa146ae80f098daec969db40990da59cd3170394a4f7a163. 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/ARKW52000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a77029583648e0f74e72d4d47cd4696904067c65f0334b882d75e1b70b23756. 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/QZGLS2062459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4fd400d8973de966986451b636a357c5c376c9e164934ada6cf27c905990e24. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ARKW52000005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d6fbd53810503ce09120f1014b0e055604d7bd02439fa838ecc2be02e6fcf52. 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/ARKW52000006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0ec234db721338eb287cf0218c00047a5d20dc889490d59f8ccf1cfbe207b488. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ARFVT1900030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca8ecbc9b5d7d21f3eaa702edcd52f70e905130cf53fea8c87f97f46a6cecec4. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/ARKW52000004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a77029583648e0f74e72d4d47cd4696904067c65f0334b882d75e1b70b23756. 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/QZGLS2062459.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbe1242c0fe925f23e5a7188199d1cc874956014ad83652c7b865f1f18a1bdd85. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/ARKW52000008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7bc9ede0b5af40ce44cd2b29142572368e8a3a5bcea1c645f0753e3974e11d1f. Chain 2 (Bitcoin): anchored in block 960455 (2026-07-31T19:53:13Z), 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/ARKW52200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f0cdca395b8d381c8b0af3c2b5f570ab02db58a2dc690396c1c49683835e7f. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/ARKW52200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a028380de0d1cf6f9b7855961560ee48a1c32d03e6f97214953075b3e8298d. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/ARKW52300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd2a8bb6f9e183891849f56542bf84a9c5847ced93a264bfeb0732c2863d356d2. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/ARKW52200001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x926c02ce61069ac0ecee3b3fa12f4108351f40e0f11cc471e427a52dc793eed4. Chain 2 (Bitcoin): anchored in block 957025 (2026-07-07T10:59:31Z), 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/ARKW52300004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5a028380de0d1cf6f9b7855961560ee48a1c32d03e6f97214953075b3e8298d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/ARKW52300002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x96f0cdca395b8d381c8b0af3c2b5f570ab02db58a2dc690396c1c49683835e7f. Chain 2 (Bitcoin): anchored in block 957118 (2026-07-08T03:20:19Z), 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/ARKW52200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4a2cd24b2065fb916aac041d6d6d966d64fa2439a781bfff446505d8e5d906a3. Chain 2 (Bitcoin): anchored in block 960473 (2026-07-31T22:27:44Z), 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/MXG381900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89c6e27aa4b753e0211176e5c7d97f30e12511fa3f990def5ebedf6e8e71df55. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/MXD782102631.