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 0x2031387903c10f970497f2bf3fd9c70395d6a0b5d2f80b97e8d260b6843c03a6. 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/0b2dedf1-3fc1-49c8-8be4-96b72b11581f.json and https://artists.proofprofile.net/proofs/artist/0b2dedf1-3fc1-49c8-8be4-96b72b11581f.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 0x4df07f55a41f6bebe4f21b74e2ce9fe7d072c4f7e9ccc6d767b3814b83471b90. 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/QZK6L2176148.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4e01c0f2ee0cb79a8ff018522d250b5afda48883307735607f61bb84182dd66d. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T09:47:57Z), 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/QZK6L2176154.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x889b4110d00a1c056ef3ef6a2f1c79df356870d7f68a6ed1ef576524f8ce940d. 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/SE6TI2340583.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa446a64499c98503a42b0dcc87402416d4f1231a53ae840b16ebba306b0d8fd4. 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/SE6XY2304305.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x02f0b1cf35138ba6568e67eec1305c90f16061fb452bda956688b8d3932d842e. 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/QZDA42375067.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x316c7d7c304458f45ba67a5c3b66179305fdcac25dde2c393240eb7bb1bb8799. 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/SE6SA2323681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5c067628c3fa0b9bd6243adf16c56ad4611171e63d6f74ace868ec584f4a160a. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE6SA2315426.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07b1e90e42233e994c58ffc61a056325d04f0ec383859acb4b2d117aa40c9ec1. 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/QZHNB2334256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb1c88e69c3c0aa3e4857041a7fb285a09f8ab5cee6a7b2db7531c9fd3868bcc4. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE6SA2361041.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1774a5c2354c0dd3fe66d1ba3690c1b9cbc2b829b51f1f37ad5fbc6c1eb1e809. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/SE6XW2366483.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x019565c69e018e52739378f90b905c27c61efae9f1a779d30ede4a60b44b6554. 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/SE6SA2359017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x28dbf4ff40541b81798022da09d314b9462803e53c6f16771426d9678a66cec9. 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/SE6SA2325651.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x87cc1f77f0a1753eb8b7b0a53688d2f7dfba55db86f8bb7dccb55db6b643a95e. 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/SE6SA2398505.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa545d68e9caa2165493a7cd2a0979f3c4b81a158bd433d7cce627411033400b4. 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/SE6XY2313991.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd87a4ef1ab98c7ff3cd68b91710f0b05d50937e207be55a9f41d9c7ddc6d0dcd. 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/SE6TI2300976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bf1682af309cba66ed7c656513d7a490f0d4f8e60afa7220f3c42804df510e. 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/QZK6K2450956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x86bf1682af309cba66ed7c656513d7a490f0d4f8e60afa7220f3c42804df510e. 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/QZK6K2450956.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9118a9d7ff493eb8bf16e2d8a56332cd0b241b02a56f2c888f31061ed513da21. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZW9K2475163.