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 0x057699c670079507840ab5651f73e43f5eb678130d6b81d3fdeef93ef1d90be6. 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/7c16e99a-aa56-4fd3-95d3-fbe7d66b9ece.json and https://artists.proofprofile.net/proofs/artist/7c16e99a-aa56-4fd3-95d3-fbe7d66b9ece.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 0xfcf733709ab83c6d389cb7038297a219de4f6ceffea76111b2b1d464dcc58760. 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/BKCMX2400324.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbee0e2dc2584fbf214f38f488d65372a4d55b4848ec1e8364be1da2ed75e8c36. 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/BKCMX2400436.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe18e07d1f93d1c3735c2dd00a1a40d15d32ed4b524b17608ca17104d0e62db44. 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/BKCMX2400340.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x79d3f91782665454a1a1a434a6cfee40eb171c6c938472108a55d126a1a46559. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/BKCMX2400328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019ef592344984dd45e457e0c8433cce1e94d9c613482e5e8e96d2e9ac8af085. 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/BKCMX2400477.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f228a8dceffc3f1cd3ff06dc581d17fdaa981a5051fe6a137f82aac258b64e7. 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/BKCMX2500019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x171e378fb62bd578b124272706efcfc02ccfb4734ca830dbb1c752ac7df936cc. 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/BKCMX2500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56b8722bb4cb46be5474907df27a159026a9a26472c630da3e4a0dbd10e7ec1f. 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/BKCMX2400553.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa1c2a3373df80ccece8087fe8fcbc1fa8502e1b3048ee19b8c170c7e8b4c191f. Chain 2 (Bitcoin): anchored in block 960266 (2026-07-30T14:44:50Z), 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/BKCMX2400452.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x83ab08c37e4cd3aaa9a7130ad7969d82bf74e2498e25bd1eb263b7409fc83f26. 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/BKCMX2500100.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36ca292a71101d42e8f7f49e63b8f122ac39bdd12c31fd5ba578b6da03eee693. 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/BKCMX2500106.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdb7aebc67095f61eae4033265b27b12685b18781d4071d96759a20382e96ce0d. 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/QZTV32507178.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f0bdc48019c5030379db21e2569e907eef52b89410ff27a55275dbeb67bea30. 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/QZGLS2576057.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba6cb4cd3bddb66c0f78b83d560d9dc72c0daccef34fdbba3459032b116b6850. 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/BKCMX2500061.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2fa1307a5021ff8b3ebd039955f74eebd99d0a86f05d8ef0af036739b2ecc0c. Chain 2 (Bitcoin): anchored in block 960370 (2026-07-31T08:38:45Z), 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/BKCMX2500008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80997e6360f610767e47af199e73ffbba47fa4cbb088725ecd5028769c2c6b26. 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/BKCMX2400559.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x790c0fa0ea191b2276f6618507959d7fe4cacddf542e34f98f6d827955545872. 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/BX6Y62400006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcfd0b22a62c001784c53c03faff74806cb1be0e8b7d73f990ea8754a98957e7. 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/QZ5AB2413840.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd741f4e04aa9e1fab01e4ecf5ea97043aa34004d650ace87416a2c577536eaeb. 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/QZZEC2302328.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc80cbde71402a83d36aac17d891b5b5137c9268f63cf30a595ab0b58b203bd93. Chain 2 (Bitcoin): anchored in block 960258 (2026-07-30T12:45:34Z), 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/BXUBN2200002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4caec568f6bb6aad2a00a8150a1c1751e68dedac5d5d2d2c880001ab3e392a80. 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/BKCMX2300008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x59195c1b464971f97a1d6914e413c16a9cd9df892a3f1ad1a27b9fd17ab85395. 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/BKM2L2400131.