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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4c2f4949c3ff97974c7ff6d8070e6c971b463aa719e3086cc61dea30c262d270. 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/ad18ef57-803a-4018-8ece-906e82bccb73.json and https://artists.proofprofile.net/proofs/artist/ad18ef57-803a-4018-8ece-906e82bccb73.ots, run `ots verify -f record.json proof.ots` (https://opentimestamps.org).
National Anthems of Member States of the European Union
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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf2e861416f774dcf1cd2fc21e5ba425508e1039b107de230c392b03c258b4b20. 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/CZD940900006.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x046fbc9066fee1d805c3918ac908335c679bee80e31f3ea7e4ac716e2e9f4eba. Chain 2 (Bitcoin): anchored in block 956351 (2026-07-02T11:38:34Z), 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/CZD940900008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x09b127951d080c184897df17bdc9a733360680fea7192e2b58354aff6da7b53e. 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/CZD940900009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x190f34e438bbd9f44664c62ffe26f8524f0ad23318394725691d91b80f145eb0. 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/CZD940900011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa4948e6b958e15a01ece5821e0c095bb07f7f0aaf1bb23537278813755f01737. 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/CZD940900015.
National Anthem of Federal Republic of Germany
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaac963a30c1d346afc90f7d89578b8b5c9ca5db6f38c020f7e46a3ad86581397. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/CZD940900016.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd667a5e4335730db87e9bd3dfe3940f0ca00de26ed022fb24b21b657769d45e9. 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/CZD940900019.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xafafe3729cb887b0e0c4ea3112e7741f8996f182ab32d2c1c7e52287a17fb6fa. 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/CZD940900020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x98520fbda345b125120202691e997b49962933536eb4e6d6f2298cb28c33b690. 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/CZD940900021.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf19f2f530e1fa0ff497b981d6eaa83496a4a81a72bb4edea3e40f8911e508beb. 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/CZD940900024.
National Anthem of Kingdom of the Netherlands
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1cc5d0aaa1faca8888f751315ec7332a679f09f1a8e4bb243407bcf14573a090. 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/CZD940900025.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc51f31d3c03a0edebfc3dd600b2e13c38a03b297e2120464e3ded78cfbe2cf87. 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/CZD940900031.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6beaa7d56f400d68bca2c79f893f1a11ea4402656398e29c8c9e3fe2ed77464. 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/CZD940900007.
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 0xec4a84edf352fb86d869372be5b518bd5bba7432b6ef5ae84c0ff3f1ad6a68a5. 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/CZD940900010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0f72b3f44e2db62fe2e35f386a4d4797cc043e0f722164487e0ddcd771d0bb9. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/CZD940900012.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7405069b7e1a37b45b02a27b6a22e29e8a936d06aeaeb6fdf6f84a98a68f00d4. 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/CZD940900014.
National Anthem of Hellenic Republic - Greece
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x185bb1a04565b08ccaf7b68edac00952019b471cb3db7a76f846548871574a95. Chain 2 (Bitcoin): anchored in block 960144 (2026-07-29T21:09:47Z), 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/CZD940900017.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xdef409599c55b2d6ac9caf19ebd25c883f4466011dd6625d919e71ee1fa0d6be. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CZD940900018.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf412e31a10c5f697204265133abb58e7ccdd754d1aeec0bdc11f32ce6e68c197. Chain 2 (Bitcoin): anchored in block 960397 (2026-07-31T12:24:41Z), 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/CZD940900026.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbfa2048f64e0935461837ed129cf0860a4247dc2401715f85b919559a393cc08. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/CZD940900027.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcf0704fb58dcd1379aca842f9c8efd37245eda8d61b9482505cffc642e3fefa4. Chain 2 (Bitcoin): anchored in block 960330 (2026-07-31T00:58:21Z), 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/CZD940900028.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfd2f05d89c93c8e5b6b23f79e4532a4d2141466127cde83bc3ce0193f5f8a9c3. Chain 2 (Bitcoin): anchored in block 960376 (2026-07-31T09:09:19Z), 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/CZD940900029.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8cb99341334e39e1150e2b60a61525c8e445608d08a3d3fbb1810786f6c1c098. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/CZD940900032.
National Anthem of United Kingdom of Great Britain and Northern Ireland
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x683ae3e087abc14f24021c9c324e6c6161bc08f9be2cc177fc044ede80c96330. Chain 2 (Bitcoin): anchored in block 960236 (2026-07-30T09:37:10Z), 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/CZD940900033.