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 0x2a94bf8c05a4024f1d01e4b0b45513564a06cc021c60e434fa12697c850dc9cd. 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/750fda5d-ee7f-4f32-8f6c-ca171cf23ee5.json and https://artists.proofprofile.net/proofs/artist/750fda5d-ee7f-4f32-8f6c-ca171cf23ee5.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 0xc8ee70609842e120c024efb7d1731f2d31d6bffb7468553c8ac10615854c7e8b. 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/HKG732384617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20c4c7dfd8e10d76ef24b642abe1e3d989184d4ee6a965b6e7d32b8c0a696f82. Chain 2 (Bitcoin): anchored in block 957819 (2026-07-13T07:53:33Z), 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/HKG732447255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd0d3d869b4f449a2e1670d38bb5c7a1c01d1c9aae1880802635907b26ab1776f. 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/HKG732447256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1bf296c4df88f2b493a76b7a198652d8b55b3b45e1915c969add844a7a8ed4ee. 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/HKG732447257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cafc452bf4f455c9c6a2a8c9d8198773706a338bc7b1d789f55d8a100e2d0d8. 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/HKG732447258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa14cc181c1885e888fbd92cc9cfcaafd9454e23554c4191878fd9911bf0c3b17. 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/HKG732447259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xecc2a110ca855b5ae4d06fb84d395f398ce02fc447432524f823056ea139475d. 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/HKG732447260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x12d8b79e3080da6fc99c3fdcdbe3914b9d59ab2c73f83076a07d70828d46b5f2. 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/HKG732406764.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf059b9b560fb6f6d69c43374059a0f4debe6fc3793a96f3e1a9299b3e3452caa. 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/HKG731670837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfafaf45836a1f886553e9464cbe20679967a4703bc94cd2ef6a1bb92faa4d3c4. 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/HKG731633659.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9096a8b285cd5f237935256fd1ab2bd5f2a2f85cf388b9b70b630544feb81b91. 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/HKG731605680.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5f4367b01746e472835d96c7dc358035c75c23f4f5fb89b29604cc437ed4fe1b. 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/HKG732381999.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdf9ba696faeec552a2cb65ecb8e7fe812bfc726d08a43b250eae8a40b7aa30be. 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/HKG732374058.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfcf6dadb4c0102576ff038a5f3441440d6ef26b81757fba189e29eff0ec7b97e. 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/HKG732345047.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf5ca5580098867d8c35f9d6a53831d61ea04957643d8b17eedcd8f3bc4fb0239. 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/HKG731657012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd7d3a30959b522b5efc38fd22436486014165b52871e8d8da78c2d4c82c544b2. 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/HKG731657013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcb1603eb2e83d17c35e24d8671c4b0df914ce49b456ddea931f4a34e89475098. 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/HKG731657014.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2aa22aa4d11ba9cf9a27d43e43e9137984109f57f7bfe8487b3a79643c7d4faa. 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/HKG731657015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xca797c4e3ead6ab113d9291ae5e8acae1cb67f8ffb987b7025fd722cc2986c64. 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/HKG731657016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb31fdd126d2af4887133b2e36914489fcb83ea0e02fb6fc4faee4bbba18c139. 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/CNUM72400254.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5344d3173b611a02f478a373f20b7bb4b82a550ec91a5ac8b2648ad41eb75cc. 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/CNUM72400255.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1092f81201ee5df11f2d8bb106daf97ba1d9b3fa140f98b7decc6aee63ab3949. 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/CNUM72400251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1effb981eb29bc38a35c948d1d4b6570b315052c4042c75cb1cfc47415a73391. 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/CNUM72400256.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd380cf9dbd11d80143f9cde9dc14b6b46c90b9c7ed59dd2899661d92f3bf4e8b. Chain 2 (Bitcoin): anchored in block 960121 (2026-07-29T15:22:21Z), 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/CNUM72400257.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9927dad764566d7e554a3a5db36c581b9df75f65cbfae5037c72ce7f805c544b. 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/CNUM72400258.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3212baccbafb35527e46b92744c2535452cab801ef705cdb7484c0e1c3691894. 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/CNUM72400259.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4116e19f1e202ad90aa04723cd8758de979f6d97a36adc675d2538a985a616f7. Chain 2 (Bitcoin): anchored in block 960183 (2026-07-30T01:10:20Z), 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/CNUM72400260.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8c98fe4f0da62bf5ee7ee10505e58492a247684ef5f0b228cb79b42480490caa. Chain 2 (Bitcoin): anchored in block 960203 (2026-07-30T03:35:13Z), 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/CNUM72400261.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8d1a99e8d8ead30046aa1682a49aa3d63c6adbb3846985379e24a1bd15cc8a04. 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/CNUM72400262.