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 0xb9ffa487263a6303111cbc547f458fe38eba6ef1a689b5d6077fc6259800014f. Chain 2 (Bitcoin): anchored in block 953750 (2026-06-15T06:12:23Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/ab6e9c0f-3ed6-44cd-b8b8-dd79040d2c9e.json and https://artists.proofprofile.net/proofs/artist/ab6e9c0f-3ed6-44cd-b8b8-dd79040d2c9e.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 0x4bbab6e884253671ad51112129d4bcf44308aa1e25272dde790fb96f3fb276d9. Chain 2 (Bitcoin): anchored in block 960284 (2026-07-30T17:23:26Z), 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/VNA1M2284449.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0a201d38bcc8934bd18282921a36e6b9a5d6ffef0d8ca445ec30d13b49895a5c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/VNA1M2281261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8416b456f89a11d15fc2592843439327074ecd7b46cfec3df090f435a3091ffd. 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/VNA1M2278181.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87765856072bec5e6c5d00b3f85d1118ed35f29d7f87818e9d1b62fab2988456. Chain 2 (Bitcoin): anchored in block 960150 (2026-07-29T21:51:49Z), 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/US38Y2512333.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91dfd5dcae9c5c77fd4820d15daab1ce7c3254032ab1d362ca052827d84a8e54. Chain 2 (Bitcoin): anchored in block 957032 (2026-07-07T11:43:09Z), 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/US38Y2511226.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81973d56a5841995707a9f8d208453f9b0fbe9368d05e0bc60cdf614a9be3bc6. 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/QZYHM2424771.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25350806494d67228458474c55053fbcc7e264f0fd5e0ee56e95db84673f521b. 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/US38Y2434409.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb18fd023c86d8dc0178deb9a656a3b394dd0c34aa27867191f49128c765ec3c5. 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/QZYHM2425985.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03f7b5237984ccc58a329fb8e800c73383623e1e5ae83e5fd0411e6c2530507e. 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/VNA1M2290752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x69c8067856892c835764aeab803ae34e4262b67ff9c400ba6809f2c07451d40f. Chain 2 (Bitcoin): anchored in block 957046 (2026-07-07T14:04:01Z), 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/VNA1M2290542.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x064168f3ef073f11354c07014335b1ad54bb9c0c749ed325df651fad0c18e0d5. Chain 2 (Bitcoin): anchored in block 960352 (2026-07-31T05:48:30Z), 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/US38Y2417307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xadff9d7959686c9c0d678a25abdb0ae389343a35846a48968e7becc6bc16ca49. 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/VNA1M2281340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x556cd7888e378f78b78b3675c5f60d86ab6bafb021dcb1de38f2a8602ab7d953. 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/VNA1M2280646.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e98adfc5390f2d36cf2ffb6051178ef0784cbf1b2541579e21372b2f9f5afb0. 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/VNA1M2227377.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ce58cce4b8963fca7cc2cee0d98e4ed2a229b2801f83baf53b51f315c964560. Chain 2 (Bitcoin): anchored in block 960216 (2026-07-30T06:39:12Z), 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/VNA1M2202248.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6263ccbbe29371acc06fc5de4cc79b4576dd87f3c1dfb8ca831983053c6b5c4. 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/VNA1M2201285.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb410cbdfe61d80565492ccd2710d9cd1473d4903f4d64eee85c2b8208f6bea89. 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/VNA1M2200554.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x630d2c08f7c664449d083cefe511e5046046cecf7118b3d9dcab9dbf090671bb. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZYHM2426291.