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 0xc02e6d3c2285c7910ea6ef5c82b4b3eb80e21394c67e3aed86de0ea3c4ef1f21. 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/f9a26d53-33a1-48c2-b6f5-158d7adf5876.json and https://artists.proofprofile.net/proofs/artist/f9a26d53-33a1-48c2-b6f5-158d7adf5876.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 0x21bac4a0c301949c10eea25dee33386f1ae4cfcbae714ce526630b831878d14e. 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/GX4R52266454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9409490e5ebd99e0eca1375255923e6d102ab046950b589b2e8b3b9287b38f0b. 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/GX5MX2230931.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48658522b7c938dfa0494c6be2b55081910255361012e39acaee62f77292f544. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/GXBDS2367004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac14f50fac36d3f0d902c8101a4eb5cb458588fc1b581c9ac6acd0bd60656a89. 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/GX5MY2343424.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f4ddaa8280223bdbb5b42cb4b958aabcc907241b6c2d0c9ddc52f7092cd6aef. 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/QZTV32365253.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5b7fb70fb8501d67eee1bb894b6923e59f69fccffac6a4967df7b77fa34397e. Chain 2 (Bitcoin): anchored in block 959145 (2026-07-22T15:39:05Z), 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/CAQOI2301259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdc4d286611b9a9b23349297943ee108ae6600c31ee26f7d9a6e7132fe1efb893. 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/QZMHM2340960.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3749ae953810ea9bb3f5280c014d571da52ea5bd2b921e47fed32e2d575b5c98. 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/CA5KR2323386.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4be2c1fb77e79f461e6913a1875357d34a9252c03bdc6fce4c3dd1422b5b473e. 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/QZS662254927.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e0e0d6275e7d843b84819f57659c7096f03512792b90068c8d296e2b632be62. Chain 2 (Bitcoin): anchored in block 959123 (2026-07-22T11:35:32Z), 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/QZS652291138.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae5af7e02f9f4a5253e15266edaef55654b0e088bc8c858163b4c2bb29723046. 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/QZS652133656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0cd64e6f4b5f8ca1e687ac08c905ac8704be69de6a4beb5fd11064175cea02f8. 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/NL4VT2100107.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93effa7dbb106306d51d2d65f60de71904a20b87b1b371d9425b70ecbf985f51. 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/NL4VT2100108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe676ed4390d1be8309990901ce3c528328e4e7d7e84b19920d703c01fee9456f. 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/GX89G2296593.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf53f9942ac7e9585451cb02b4c95f5beaac887b351d762c24f036d496e4d1fb. 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/QM24S2102700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2262bb3cee613b386ec0b2b026804cceb72ecb8d82a86bdbb4c948c292f9a629. Chain 2 (Bitcoin): anchored in block 959144 (2026-07-22T15:38:35Z), 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/QZMHK2019295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd34b3909771fd84bda8727acea0af85942c289a33638c2741af33ae8ece0b287. 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/TCAFE2065514.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f66ad1554704f2ed71d8139f2d0a2f9a71c8e26ca68a5b34c77b5a09f287060. 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/GX89G2351930.