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 0xf2b7c3a5bfa28a5ee2a17e3f032a0adfbbf6e154c53734bf6d0b7d7a76703acf. 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/3ac94530-701f-479d-bdae-f41b36917fca.json and https://artists.proofprofile.net/proofs/artist/3ac94530-701f-479d-bdae-f41b36917fca.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 0x82e8580b2e57eb54cc55afde88b8678139f9c33d8ca6bd47906641e430e6e9a1. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T02:46:47Z), 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/TCADX1897463.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfb8cdc7ecb34529f45fc15961c68f3fe824a8d686ac980c9e44188690e4cfb61. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/TCAEH1921469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad69683372ac72676302291f76250476b03bda39384aa7457e7fe254f72687a3. Chain 2 (Bitcoin): anchored in block 958644 (2026-07-19T02:21:25Z), 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/TCAEL1990989.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03e98dbc26f9b8b37f332d0040a3ea7a69993f1fda4d72d625e1ba5d44775ca. 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/QZTB42295870.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x351c801cd2584f2a053c830cf79b550083581dc63b6a52ffd609e5b1a8df7871. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/QZRP42356070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x431f1c804fce377d358ab1649609d551a72037eb7c5409bb5a5406d6b1ff1a51. 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/NL3GQ2100504.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb80f435fc7582fb769b3cd4e78d20766671aa34f4fa149c74f698c129beebcf8. Chain 2 (Bitcoin): anchored in block 958455 (2026-07-17T21:28:36Z), 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/NL3GQ2100682.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x16262b9244b50f636b223d6e35304532f4c30dbd063eee45bfed1435786b2dc9. 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/NL3GQ2100650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9aabbafcec158fa0fd3a25325a61e695c0f034a88fa58412505402abf9cc2880. Chain 2 (Bitcoin): anchored in block 958362 (2026-07-17T04:32:48Z), 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/NL3GQ2100684.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6dea1711845bd493868096187309b4f69981f69c0ba9b8a941c55aa41eec1b50. Chain 2 (Bitcoin): anchored in block 958140 (2026-07-15T10:05:23Z), 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/NL3GQ2100685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2ea650d79412cc1e38416f52084b4fe0e9fffbd80fed97a874f46428c0e022c0. Chain 2 (Bitcoin): anchored in block 958711 (2026-07-19T09:26:32Z), 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/NL3GQ2100686.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x72d6d932e5119e011d5d25abaac8f6c32e84d8e2bebc57872251e16a321bc5a7. 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/TCJPF2562578.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbd0842e0ce254b5c297e77d59d1cdd5eeb427fd108b59b54f6bbfc955c707734. 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/QZMEQ2251064.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da56ab02ded92020eb2fdf3614d1542d34d3880c1d0410976cc9f2f042207f5. 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/NLS241700304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a1e95c2df0193aecb138ed4b0b389cbd9994370ce884e525005d3d1c2e9e3ae. 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/NLS241700325.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4da56ab02ded92020eb2fdf3614d1542d34d3880c1d0410976cc9f2f042207f5. 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/NLS241700304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84a99876bf51f3f9f59baa1af706443eed627804a43259e363a1f69b1eeb6c4. 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/NLS241800040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6d7ae7512c9c28a0805f41536b433eabdea5eac20d33a83c048391dbfe5e5101. Chain 2 (Bitcoin): anchored in block 960427 (2026-07-31T15:59:18Z), 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/QZK6P2008379.