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 0xabc89acdb1d4275d8e6de944541d201757deed606b1fd7367051f8525fff3876. 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/c86f9ffb-b67f-4ddf-bc5f-a9dda517ea67.json and https://artists.proofprofile.net/proofs/artist/c86f9ffb-b67f-4ddf-bc5f-a9dda517ea67.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 0x0514c0be910b10ec3146c81f426cdf55bf3107a53e4de38d511d77af48848ea9. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/NLD682001602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x719434d45bab5948e3e4c23e7a6ee03014a9e537a00764abe27255c277974899. Chain 2 (Bitcoin): anchored in block 959159 (2026-07-22T17:48:40Z), 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/GBKQU2203591.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc33cf80604996dedab3950650a7ccc3fb5f19c2a177af9243653cde03d6b50e9. Chain 2 (Bitcoin): anchored in block 960285 (2026-07-30T17:26:40Z), 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/GBKQU2203592.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x636aebe9c4051866cb728b43707b2d2d33ba3eaafbb2ecda62f1434072797a5d. Chain 2 (Bitcoin): anchored in block 956745 (2026-07-05T05:33:35Z), 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/QZPQ72100111.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44a5bcda227dfccb44b6325f3b35ef11d452beb4c2bac15f6f58a852f43e6e3a. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/GBKQU2455206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x52ccde724186795e97587c476a5d40ff3d6cfb5cb8226c9fd66527c2c34984f6. Chain 2 (Bitcoin): anchored in block 958816 (2026-07-20T03:51:05Z), 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/NLD682401647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3e88e73274f84ce40f3408e30ebc4d06ff16ea9adbfb024a8b0ffeb24ceb156. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/GBEWA2404560.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27ccaf6fec86a0e680d0dc4a76e0213ce9394c9e4670518985db9af67f90ca5e. 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/GBEWA2404561.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x810e4a4a5c83115564611cdf29f15091af697f9288b27d7b40a120b5c1444300. 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/NLD682402904.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb49681729dc4461bc5f5bfc2919ba5804c0589fe78e0057a344231342fed1812. Chain 2 (Bitcoin): anchored in block 958885 (2026-07-20T13:01:04Z), 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/QZPQ72100258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe21cc79417e2e0e34c3f502d1cea6831b452b6e4b4e856a52baa2a2b86478c2a. Chain 2 (Bitcoin): anchored in block 958600 (2026-07-18T19:24:05Z), 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/GBEWA2502674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xabe3dcc83717287cb1c64baf27f7fde03ab1b59f25abca2b68efdf3fe2844f73. 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/GBEWA2502675.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2550fef0c00e2a7d5031dedf22890e066a7dd95b62ce4ed828357dd7f6c593c. Chain 2 (Bitcoin): anchored in block 958115 (2026-07-15T07:27:09Z), 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/GBEWA2502676.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x04b23e200c265a827168416402e1e17a9cb2e29c96cbb068aaa4864540e56abc. Chain 2 (Bitcoin): anchored in block 958917 (2026-07-20T17:53:56Z), 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/GBEWA2502673.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc0880026366ac5215bd065ddee362b201b13d373738bd485ab2e2672f93e191c. 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/GBEWA2205610.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x94a253f07df6efa9894d9f2609b80e3072a0500a24e51be60f7e528a31260aa9. 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/US83Z2151613.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03427eec2aeb7c40332929c4642b572445f829151fad6644e53041028e82133. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/US83Z2116313.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x354bb4608d408ae3f94108a6765786ead6b09933539238ef99d9349b5efa8071. 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/US83Z2116312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c5b5aedd604079712973dfba726e4188872ebd89fc1d1839cf5ec5c85e6a2f4. 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/NLD682101279.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x17dd39f4fae25bf1f90853e6dcce390eb23866b57f6049fabd094882c4d84ddc. 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/NLD682101280.