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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86e5dd8ea870db29c284830baebe4d9bcd729dbae512b0f01abf756c8a32dbb8. 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/582c5a34-4a4d-402a-b315-8608b1ac7b02.json and https://artists.proofprofile.net/proofs/artist/582c5a34-4a4d-402a-b315-8608b1ac7b02.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x612d4a660bcdbaa323ee1ade48f4bca02cba11b64e3318e789dd29ff2a229dea. 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/QZHN72460779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62fdd4faea93a31b4c3b833b121687237a88772e3d9c4e7cc9cd3fdf6232cd7. 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/QZTAY2345999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16f298018f1c5fc2570c2e64fa717064b8d66d6af59aa7245c68e9d6ad53549e. 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/QZNWW2468882.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1a2624df354898930ad4fee8cc6c73c40701c290b4e4378ebf74b994f8ee9ff6. Chain 2 (Bitcoin): anchored in block 956894 (2026-07-06T07:53:57Z), 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/QZK6F2446309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7565b9ccf69be6bf2158fe2638f2718f1aaf6f2212e02799cef62549ea24ac7. 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/QZNWU2494159.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ca3b447dc7ecb04b05c4cc9e349c3fbe2515b0e603d97e5078678a971c17db0. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/QZS652283299.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e4ae8e741a5a4a09ca439cce8f261de7fcab279a8fbd772b45c8abf6863e796. Chain 2 (Bitcoin): anchored in block 960153 (2026-07-29T21:57:12Z), 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/QZHN32430778.
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 0xf91ac06a2cdf4e208803689ae2156d998595034775d03814dcdba1834ce8cc4f. Chain 2 (Bitcoin): anchored in block 960113 (2026-07-29T13:38:16Z), 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/QZDA42482794.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3dc1c96d1ed678c493cd157beffe2f611925bd2722ea4487d5a470f95e8bf21. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/QZTAZ2414720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ced868b848b6b8bafa7d278ca5de443b5c77fb1e2e55f9b88d0c7e296b1f749. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/QZTB82243691.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc35f095989aa43315117528092d3a3b10f96e3739bfdb1fdc8a08aa2f7edbcb5. 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/QZMHK2229583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc636fbe711af512c581983e066dd7d5f05b907742d0889d0c773d2df6c7cc58d. 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/QZMHK2278149.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ce9c07e948d6e24c0e2b9caeb179afe21ac02d531a4ecae8bd0887d9169222. Chain 2 (Bitcoin): anchored in block 960254 (2026-07-30T12:06:10Z), 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/QZS632226989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2d36b76f0731f64f2c17701b677464022d5c38c3a8584a45ddb0ecc9d8e63dd. Chain 2 (Bitcoin): anchored in block 960403 (2026-07-31T13:04:34Z), 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/QZS652256237.