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 0xbee881858aaeac0c64bc41020684439df529cba68fac7baec7f5459f007178cb. 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/670c9d39-7f4c-481d-8535-90e57b1bef22.json and https://artists.proofprofile.net/proofs/artist/670c9d39-7f4c-481d-8535-90e57b1bef22.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 0x712441808763527216a5624ba32f53c0fb2e4735bf79c982067aad66fc370b2b. 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/QZN882116721.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2516839022e681cdc316798a0a4170e5ef9a7a7ba46953989f12b378864891a0. Chain 2 (Bitcoin): anchored in block 958256 (2026-07-16T07:22:18Z), 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/QZN882116722.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd58481c1ee981335fdf17055f5e548c071e3a233751d24c255ce9e1dfa82f9e2. Chain 2 (Bitcoin): anchored in block 958480 (2026-07-18T02:58:58Z), 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/QZN882116723.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x620ae1a8115b72c3776645796259088e2cfd2cadb9b4c68d0c852a85dc67458f. 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/QZN882116724.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a87ceb7bd178b9f11b2b6aac3339f7864385feefe145511fb6775a130c5ab2c. Chain 2 (Bitcoin): anchored in block 958761 (2026-07-19T17:49:48Z), 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/QZN882116731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0d4847431a98e29d193616ed7ddd6ed5c34e7584624b458a95cad4bc174095fc. 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/QZN882116752.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbdb788fceed16dbe4195edc8235cd921463e0099726fc36235f6d7652483514b. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZN882116753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd344a962e214b882e77e680dcf926077ec4a9ffaded21ded9e0408722127a38a. 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/QZN882116754.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411c3684982f41d0565bfae58212933a293abaf5b0269f1dcf54b7043b10ffa7. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882116755.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x411092278bfcf2d5ef1c72f78bd88b8bb8ac1c0da813f066286dc3c00f574179. 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/QZN882116757.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15009b0d32f2f4680ad814e3504ef636771fb67bbaf1ec82ba8ae64fdbe74731. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/QZN882160202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3a4ac42dc33c06277c1ebea0ac6b0e61b2ec05ea78e205d7636ecea5bc9c05c6. 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/QZN882116711.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb54bcbdc57fcd578e49cb47fbee50aab30f11cdaf815ae0f35ffdfd5b9ad8dc1. 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/QZN882116720.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x63edca85197e4c275347cfa0b9c4b692b93be717629a800b12f5c51a51fb3f90. Chain 2 (Bitcoin): anchored in block 958975 (2026-07-21T06:12:52Z), 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/SKB700600301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x78a845cd3a1a3494ce32cc48607eea17631e57239f0df161bb6f0140db0e061d. 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/SKB700600306.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86eb1b023116960f19b3c5045fa71b01926614a4bb99375983e1d9895ffc9bb1. Chain 2 (Bitcoin): anchored in block 958474 (2026-07-18T00:59:09Z), 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/SKB700600308.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe22c1ed2dec651cd633bbc75cef807b764c347a50ca70195e7632316547f181c. 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/SKB700600309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1dba3149023f57ca886968f2877c43f0d601c30819375613e5f9a07baefe120e. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/SKB700600312.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x613db9e9bc6ffe7bbbe43535822b23a009a9f92d7c8a5abc41ef775323a33013. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/QZN882116736.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf7adadc5e39be8269f05b18a3cd95f9e55091e1aa1d0480a45def7e38008bf1c. Chain 2 (Bitcoin): anchored in block 958060 (2026-07-14T20:39:42Z), 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/QZN882116742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98fcb37bba31c1a5e6e5bdafdd4d3d3dd15d1ddb64a34be2dc6e2c8377352679. Chain 2 (Bitcoin): anchored in block 958543 (2026-07-18T11:58:44Z), 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/QZN882116744.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x601a6a329edebed7cc01fccba2ea2096c8ca8a3c4ccfbda22c11447d147dc932. Chain 2 (Bitcoin): anchored in block 958447 (2026-07-17T19:47:19Z), 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/QZN882116745.