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 0x33056552fabfe9f19312379a22ade25f679e12e00c1a6d728f6dcb37ac98d88d. 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/f5d8100d-a513-4f67-8d17-c863d6fa1aa6.json and https://artists.proofprofile.net/proofs/artist/f5d8100d-a513-4f67-8d17-c863d6fa1aa6.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 0x3f2037dce1b7a533781343f8f0237f29c951ef918894cb7e4cc8b33cdd3c1921. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAID2454685.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1ac963da1329c15a7fb6990050fccc86ad149565ebf66e696c1715eafb4b973c. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/TCAHI2327647.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85341b05f2ff4eb2a685a90a5c7144a9b2f5e094e861276db8aaf75b8a5b283b. 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/QZHZ62153402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfc22debc948c14e5f2b52f86b5eb2e2866b6a7052aab5f6471f8ebae6e55cd25. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/QMBZ92028186.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0b94b749ceb6f59658414130786592aaf8678173c1a554354bd2ea3ed260b7c0. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QM24S2206057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6962e0cd79a8921ec24ac4282859d9a0bf0d62146653c0be94d38faa71b2f0fe. 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/QM6MZ2205448.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc56b0a82a1a338ba4e5f26bd9323009d6de53404edfc19b38603dadc8677e40f. Chain 2 (Bitcoin): anchored in block 956889 (2026-07-06T06:56:49Z), 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/QMDA62144341.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x708f8863a517b3781d2894858c22ece81bee247c36485f89de7b48db8c0c1b67. Chain 2 (Bitcoin): anchored in block 960513 (2026-08-01T04:52:22Z), 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/QMDA62144351.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7713fbe9f962865233bf7cb8879c89809ae02a35b19e3a9c99362be20a30e45e. Chain 2 (Bitcoin): anchored in block 960387 (2026-07-31T10:06:30Z), 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/QMDA62144356.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf67cff044d82287390ef29701e87b5595ced3d03e2db07d7e5ea7f8bf0b273fc. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZNWU2224391.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe06d68a98557e6578dab581383e66a7b4d997166aa09bdfa35bccc8c12f7e71e. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/SE6XY2550650.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ebaf9f70b06346d10d0e3d40d21b71e88025cd67dac9fb73d9d84dfe4f36820. 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/TCAJN2510354.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdaf29d10c9f33b4c0a3afd89e3671a8087c234a070c08b8850f805a1085228b5. 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/FRD602425493.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b26b395a807d4cfc865f1da3be2aa8eae8377007da4a5f2f92991e111716468. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/ESA012494954.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1346d3f7574f1f5f62084cf4106df35ab2ce9e3200d12de4205e8670334db18d. 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/TCAJM2569251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15beae289d7509939b013f65eeae04e40a241ed7510d498eb88c141381a504f6. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/TCAJL2569418.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3288b3200d6a6d8c66b25f5f8adfe1ae88b045e3ab7036b7b09bde5cc4de5cb2. 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/TCAJM2521432.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5700ef0ffd897ee1f621fbb2adb23d4619e4dd14ea0c56080f04658cf0aa360. 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/TCAJL2570051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63e3268fb537fd5423ea02714fa49deac9715eb1017281d0e55726f751d9a7d8. 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/TCAJM2563556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb568eccea679c25b8a257f5a787e287fefeb7ad016cb7f05a8f0f7cc20ab2237. 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/TCAJM2577039.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfa89013f5a3f841cc089b63111f011308a6903234f679c3ec1947d1f56c6c25d. 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/TCAJL2569038.