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 0x7855a8bb3c13aa2a0c30678fb722fe5c3cc3c6367e711fe2afe82e562219e70d. 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/1af4c353-5711-4cba-b64a-eda36a853985.json and https://artists.proofprofile.net/proofs/artist/1af4c353-5711-4cba-b64a-eda36a853985.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 0x7f6f88fe120ff457cda6e95642e8e73b1a678734d03c00bd181df30b020099b5. 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/QZHN72093432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbb11e67f503eb6dab8c5701cd24512df8db75d2966d019791c5bee470dc70258. Chain 2 (Bitcoin): anchored in block 958931 (2026-07-20T21:15:01Z), 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/QZHN72093433.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdd092a985c2a6b334fb0b1f40800c752f8107d6613efd5649998f4b3cde1e4a3. Chain 2 (Bitcoin): anchored in block 958388 (2026-07-17T09:14:21Z), 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/QZHN72093434.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ade08ac5e6d125a76baf4034baf98bcea2ea354f2c8c523276ac104b05b27d3. Chain 2 (Bitcoin): anchored in block 956397 (2026-07-02T21:02:00Z), 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/QZHN72093436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc96395a2eae11815a8bf690383c360e95c063488dd2b8fd2d68b36067329227. 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/QZHN72093437.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb21e3983dccb9cd2fae0f0bf85e7b288075f237641643779e7810b581787ebb0. 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/QZHN72093438.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4aa2bdc970d5bfb84bad06da9502dba34ffc1970b8ddfd3d211d038a49705d90. Chain 2 (Bitcoin): anchored in block 959008 (2026-07-21T13:14:05Z), 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/QZHN72093440.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62dec9642bc14acbea724b93befc9df73a3ee094dcf097e23b0893f63f187cf2. 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/QZHN42086637.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeaf860197ca12bf44ae7bd6227587181413b48f3f4a69b1d87970fa885ff588e. 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/QZK6F2323539.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2224503116bf02f2b49785a12f536f8b7f84303a1ddabd2174393ef00a7948f2. Chain 2 (Bitcoin): anchored in block 958654 (2026-07-19T03:55:30Z), 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/QZK6F2323540.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x13128a62f3c052c5bf9401b5a2d6948aa7f45602fdcb8bc12cd6385d3ba84bb5. Chain 2 (Bitcoin): anchored in block 959001 (2026-07-21T11:41:42Z), 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/QZTB42238613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ff8e730e73b5e18b6987673ea7ecd1d8b609cfc78680ccb902b2625a83d59ed. 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/QZK6F2323541.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xccb9412f01cedd58077bb976765cf55f98fb0bd7110160fe5feded5592309c0c. Chain 2 (Bitcoin): anchored in block 958152 (2026-07-15T12:00:27Z), 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/QZHN42298461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x35f73bb3e75c6b754d28dc2cc29f722b4b2649aacc6aaf5817045d4bcb0fb73a. Chain 2 (Bitcoin): anchored in block 958461 (2026-07-17T23:18:11Z), 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/QZK6H2371973.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x465e162d283477d9c61f17051103dc667b208c3d2ac44c463391b256f86f800a. 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/QZK6F2323544.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe57c403cc2990b3e2a5dea2f18742c065cff96b8f9eb82226c54943393a39cef. 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/QZK6F2323546.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba0f5c24c38aabc0acdecbbbee3b6d3a0563ee54816fda42737e99ef1173761a. Chain 2 (Bitcoin): anchored in block 958776 (2026-07-19T20:11:59Z), 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/QZK6F2323547.