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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 0x3143744b76ee8a2c084b8ca36e398606a22dcac0289ed99eec2e71ae3e88d6ad. 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/349dfccc-0400-4c5c-b35c-47cbe0a1460d.json and https://artists.proofprofile.net/proofs/artist/349dfccc-0400-4c5c-b35c-47cbe0a1460d.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 0x9be295fb6b94dbec46a45873626f0af3a48752d434481f00f848dd6c4c38c8cf. 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/PLC061100842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x32b3b7bfb9d7871bda95509d862826e5eac9daea5376feab33fc205fc8fbe73d. 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/PLC061100843.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d87a5281119dfe226eed3698de7546e40d3c8ad2e7e16752c8ae5bc9a0ec087. 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/PLC061100844.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4f11c7d05263d3d55cb7a606b8b5386d21b5cd4e4134ebd50921f5bee45641b1. 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/PLC061100845.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb967da778bb335c78cc7427e698a0dd0a1015343ce23279c696a11ab9fc493a8. 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/PLC061100846.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x67ba8de41f00225f4cee5f5169cbac0f18fab6824a86d3ee0a5db9f398205577. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/PLC061100847.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x08f35b82085991ad9a87d9a698c025c27e078b6e6b7ac2cdf511d3461b5299f9. Chain 2 (Bitcoin): anchored in block 957050 (2026-07-07T14:41:13Z), 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/PLC061100848.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x06bbfdd5145b804855c75e8eb20753bd1ae27052154147ff4cb39c8e2a84e978. 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/PLC061100849.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x501b323533ab7c70c4ed10468c40c7b561d42d9f442188df3db802f91e396776. 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/PLC061100850.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff34d708514a79f80cfb492113afda4ed2c8864d27afefef24a71f142de502ff. 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/PLC061100851.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd89326ebd651961c3d1121fb5f7b13d0eb5e08cfcf3c0e51ef72e51518589cd3. 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/PLC061100852.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x43a419db2de3021cacf35ca41d2eac74924aa202dd17a64a32c6aa857ceebb8c. Chain 2 (Bitcoin): anchored in block 960181 (2026-07-30T00:53:20Z), 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/PLC061100853.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ada0e19f3f1d39209c6d1caefd00f3d69f13f3103d5dbe41c93c606fd8ba3ae. Chain 2 (Bitcoin): anchored in block 960105 (2026-07-29T12:35:17Z), 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/PLC061807400.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x247af2a8993c222621eba06f95dbebfce3cc29c6efeeebff0a6852a497aa8c2a. 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/PLA680200238.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6168cde36c595f46e54e5a1c5ad72bd2b96a98faf5f9eca20620f71c738e835f. 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/PLC062117704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb46a84dd674223be8c9ca0bdf028fe6da932fb02510459ff18f4ae6efc10c961. 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/PLC061806753.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6f756d2dbed9da06acfa43fa8fc7ae91af490ec2faee50306757692fdc74c6ec. 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/PLC061706190.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc71d1b24b5e8dd5e7e278d1e4b8bb5162fbe71d5eff06ebf9f83dd08e1386d83. Chain 2 (Bitcoin): anchored in block 960334 (2026-07-31T02:19:15Z), 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/PLA460501301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xedf3085164426d7ec2588b4ddc3e3bd4f72220e065c08f58c181fff400a93df4. Chain 2 (Bitcoin): anchored in block 957120 (2026-07-08T03:22:41Z), 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/PLA460501307.