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 0x6238b07de03626654b45f987567ed0ad345e20fd6d758970903b797319371410. 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/cf8d64af-a288-4889-9c07-a223897a2abe.json and https://artists.proofprofile.net/proofs/artist/cf8d64af-a288-4889-9c07-a223897a2abe.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 0xe5b4f3bb3e7810709f8235c39ae9e85840920b2c9ddc4ce65a917e02ef381d2e. Chain 2 (Bitcoin): anchored in block 958428 (2026-07-17T15:15:14Z), 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/US4R30749078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd583ac418b301be9c95ec605550be02017ce075bfc4fc0135f038f63df3a026b. Chain 2 (Bitcoin): anchored in block 958083 (2026-07-15T01:50:31Z), 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/GBLQV0600002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15cd3f3aa3239e0b6aa8cfdcfe8a49a0e0f98fdcf08beec8438f3da6760828c5. Chain 2 (Bitcoin): anchored in block 958947 (2026-07-21T00:53:33Z), 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/GBLQV0600004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa8bb9dca06a78d774bc9a60569f7e10b68fa0ed360d2581cf5daaa486d24f355. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T02:01:41Z), 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/GBLQV0600013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2525e7c0fcaf09148bd20fb5b863ba7335b533c83c2647dd054f67602a28492c. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ESA011591600.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd71703dbcfc7dcaf522c1b8c746c8533feeeaf0997721b52739ab1b5b3d0912. 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/ESA011591602.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6ce57f3dffa3368858a1c4831f682fd1d21d5ff89371ee032132edbe402f3614. 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/ESA011591603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5784cdd8d6c7cb459aae2d0db2a7fcd417ff472b69826574fde086050550a52f. Chain 2 (Bitcoin): anchored in block 957020 (2026-07-07T09:18:01Z), 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/UKXN22441824.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x88514809c1c55f3e3047f8f36be191f99004fbeb0229b38913d9ab751228dea6. 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/GX3Q92580654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c0528862bb88d5092ff70d6da7910974e5fa75b1b34207f7f65084979a9ca1a. 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/GX3Q92580656.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5e58b17a3762888cf00d11409300aeed166ad7163e1b55eefdb7ecdede59b12e. Chain 2 (Bitcoin): anchored in block 959061 (2026-07-21T21:34:21Z), 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/GX3Q92580657.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x44b55db196ef947431693017781034c611b00aa6216167352f723401442d2088. 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/ES64E2338296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc119f5dfe599b643c69bc27f01c2234f300f23201f6156733fb278229622707d. 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/NOFHH0299160.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa158c58e3d1cbb76e5fb94db7d865b3756807161fd4cfa0224f2635e74f68cf2. Chain 2 (Bitcoin): anchored in block 957075 (2026-07-07T18:50:38Z), 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/GBMA22357633.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1959e9e9aae0aa3858740157952c23b6aef109048914f9132b678622e8ff79e4. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/GBMA22357634.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9bcaec8fb1c8adb3582c3ed5245e62d403f3a29f7507831463881c002bff1688. Chain 2 (Bitcoin): anchored in block 960259 (2026-07-30T12:51:24Z), 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/ARQIW2409049.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd5603ab4bda0c2ccf09ba41ca06b62fc2e2c332122f7689802a20f01df79f2c4. 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/GX3Q92432473.