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 0x70d5a9697df9c63ce6b8aee087a392efbc9fca9481b5c5182039dc3a1e7d2cb7. 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/89021e2a-ffec-418e-b4df-69157fe0890a.json and https://artists.proofprofile.net/proofs/artist/89021e2a-ffec-418e-b4df-69157fe0890a.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 0xf6f080e3afb7478d621733e7adb73c649bb904bcd493654c740884301eece91c. 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/ITCO51750001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc105c0c15ad69e38621d8625cf514459a2943fc878a90a5f01f3a442dee77242. Chain 2 (Bitcoin): anchored in block 956312 (2026-07-02T05:09:12Z), 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/ITCO51750002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x441a5fd196286b8100cec705d9a192bebdb1d534ebc46b52d0aeb83cadf304b2. Chain 2 (Bitcoin): anchored in block 960170 (2026-07-29T23:52:38Z), 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/ITCO51750014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f427598de3a1e1a816b24065b112691588f3d36b8acb45fa3a7a78f044d460. 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/ITCO51750015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xce828d37d74e63a18b8fbbfb2de53048df393178052b7fefd0b9fadc4df0a1d4. 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/ITCO51750016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb3deb5395862a6c22fd875562b363af38d8c4caade8efaa892b3cd42a0518d0b. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/ITCO51750017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x05d79671dadf82e7bb66998999b26dbcb543876d9ae46ec38b771163b3e9f300. 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/ITCO51750018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa79d616ad24bc30fa5ba37a95a9a592f8e024ad8e3a45194bcaf6e971b8da887. 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/ITCO51750004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d47b45796bf39ec21ab8e4f5a86ef8dcdd8f4106238093c256e9823be981de2. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITCO51750007.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa155fd6be7a45fc940cbd9fd5a2d1313b922ce5284128368a2f164fbce573418. 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/ITCO51750008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x615a3a175a1daa4f59c1dcb5eae1167b81739642f046229cd260c8ee073657ab. Chain 2 (Bitcoin): anchored in block 960296 (2026-07-30T19:11:09Z), 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/ITCO51750009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6f080e3afb7478d621733e7adb73c649bb904bcd493654c740884301eece91c. 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/ITCO51750001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc105c0c15ad69e38621d8625cf514459a2943fc878a90a5f01f3a442dee77242. 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/ITCO51750002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5ea978edb9821fe0ac01c65904d00d6e5143a91195d85f7676c6b484b3d7ef4f. 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/ITCO51750003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5bb545ba038e6fd1087006697acb0aeae9bd98eeb50610057a91d0573e3552. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/ITCO51750024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2776f55895b52623d5771c3872fbb87a2c51afcfbda894c5198918e8e9a49c41. 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/FR6V80162455.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc105c0c15ad69e38621d8625cf514459a2943fc878a90a5f01f3a442dee77242. 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/ITCO51750002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x304a92c15cf98e922e2d4b0785aba4d91a1ff61ca595b5bee744ce85c7c690be. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/FR6V80169348.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe84a6e6e2bdf811483bafffd99763981dea21f577799c343f597c14667569c24. 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/ITCO51750051.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62f427598de3a1e1a816b24065b112691588f3d36b8acb45fa3a7a78f044d460. 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/ITCO51750015.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a5bb545ba038e6fd1087006697acb0aeae9bd98eeb50610057a91d0573e3552. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/ITCO51750024.