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 0xf9c295e99cc90ab43d96d4feab615852c25e6915bdd4b8a7248df9d51b13bb15. 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/7f9b7349-251b-46ac-92f3-e914b92c1bbc.json and https://artists.proofprofile.net/proofs/artist/7f9b7349-251b-46ac-92f3-e914b92c1bbc.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 0xbd16db96cc53d683c33f1b5494acb4597e2e3f1b94fe2afeb66c9758a567ebac. 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/NOCTN1426021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf800895f73f1a9bd188270e43417b64c8d6770d32c7dcc86f629c09909c1e085. Chain 2 (Bitcoin): anchored in block 957642 (2026-07-12T02:46:48Z), 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/TCABW1439937.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5643d1db7b7586b0f4989d3923d5823220c40918234a676b350e3ea41b237c46. Chain 2 (Bitcoin): anchored in block 958476 (2026-07-18T01:26:56Z), 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/NOB1O1601030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7884d8c30a54c2d61472d45271b585a8308a41ff316a73c0b89c5894a6071e30. 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/NOB1O1601040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe109b12496e49bbb21cb4bf1bd34af5120f09067f99ffb9c5c3ee9ccc0f00c84. Chain 2 (Bitcoin): anchored in block 958594 (2026-07-18T18:05:01Z), 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/NOB1O1601050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf7e546dc07a977e692254d50b3befeb9939b5d86b6816ad589db21ea1bffb9d. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T06:52:12Z), 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/NOB1O1601070.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x68983502ee9a0b8caa4b8e1ae1b535e62afd87c2e076fd76b973d7019c340d7f. 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/NOB1O1601090.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f5bafd6810187f772cb93b478898d1c113410db63fdff0f3fbe6754947692cc. 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/NOB1O1601100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8b9787831de058e91ccfa26df421f78e57b5868ed94cefcd3db325b543ae1b9f. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/NOFYF1801010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x10cf37ab3d7470c2ffe21ffc0fda53c3f1742cf9255948336ab7e3daa3f5fb57. Chain 2 (Bitcoin): anchored in block 958242 (2026-07-16T05:02:52Z), 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/NOFYF1801020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb2743ba5716b83320a68ae10b674b9fd4d5abd3da3b6efa70020a3d6b094ad7. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/NOFYF1801030.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd62100491c93229446dee60dcbde1f3583fc46c2755d946df3b7cd078987e667. 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/NOFYF1801040.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0e2e2e030fd79c540ab2ff7839a08c24a05003a25b3f8a7a8d3a1635787ffa01. 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/NOFYF1801050.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbca95f5b6fd5ba635737f730b591910b27e8e5505349419dd25fb7e3545a2da8. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T02:05:55Z), 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/NOFYF1801060.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5844e341f7f74fde94b021c8d6059fdbff585900234fe11eb638d5654d71bdb7. Chain 2 (Bitcoin): anchored in block 958658 (2026-07-19T04:09:09Z), 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/NOFYF1701020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf349989f3d97fe37c46bfc4044198f8fe54081b6e89d91281f1876969f5c1b11. 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/NOFYF1701010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc5a61f743712f6f486f264bc7283990fc50c7bca741245366a7b7ab2d42fb512. Chain 2 (Bitcoin): anchored in block 958977 (2026-07-21T08:55:47Z), 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/NOFYF1801100.