Friday is the day of the week between Thursday and Saturday. In countries adopting the "Monday-first" convention it is the fifth day of the week. In countries that adopt the "Sunday-first" convention,
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 0x21e7ab1e5595fe5aa47730a722d17f9583c56e56ef423d42fcd68550688e2a4d. Chain 2 (Bitcoin): anchored in block 953423 (2026-06-12T21:20:00Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/4dfc7304-4946-47dd-a8c4-3e666c0bdeb4.json and https://artists.proofprofile.net/proofs/artist/4dfc7304-4946-47dd-a8c4-3e666c0bdeb4.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
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32254c52185b3c370d1a2ea5cf3999272ec3d14b961017a033de6738b4ed2b3. Chain 2 (Bitcoin): anchored in block 957073 (2026-07-07T18:39:05Z), 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/NL3FK2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27b650e8e58af40b8b40465ec4de968132fb33a3d2d54ae259e351f1f58c92de. 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/NL3FK2000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad7a31231a1335d492227aa6df75b8d7cdc52273adac2c3b0a0338d44c65714. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NL3FK2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15580bce9879450f565c7aa2c1479f2aa4c05302e68742316dcd2212e1f2a192. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NL3FK2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad7a31231a1335d492227aa6df75b8d7cdc52273adac2c3b0a0338d44c65714. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/NL3FK2000015.
One Last Chance (I Won't Let You Down) - Acoustic
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9f13e2c9daee78a5b2ed11b3e583b4c99410eee7d2f09fc5392d7146543bf7c0. Chain 2 (Bitcoin): anchored in block 958074 (2026-07-14T22:45:25Z), 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/NL3FK2100011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfba9fbfb5cf483cb295b9e55e3b540737f3847a393e0a99146b007d75edd1d5a. 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/NL3FK2100013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe32254c52185b3c370d1a2ea5cf3999272ec3d14b961017a033de6738b4ed2b3. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NL3FK2000001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15580bce9879450f565c7aa2c1479f2aa4c05302e68742316dcd2212e1f2a192. Chain 2 (Bitcoin): anchored in block 957145 (2026-07-08T08:56:20Z), 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/NL3FK2100015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8eb42b6d7c594b0c014a5d6f42a5a29c0fe27b1191759ea62c5f075eced874b. Chain 2 (Bitcoin): anchored in block 957124 (2026-07-08T03:53:27Z), 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/NL3FK2200003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3ad7a31231a1335d492227aa6df75b8d7cdc52273adac2c3b0a0338d44c65714. 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/NL3FK2000015.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b7234421e6ea40d08cbee33c87b341c68c9a6b73147c60c9d6bc1b7c566e95c. 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/NL3FK2000002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f279320cb3bb5f2714afb2739b6c8257f7c9af5250f19720acaa718e057fd4f. 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/NL3FK2200004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8aa30ba78ce5f93e1d56576f3490a780ffeda6f01a93d16d1350699417db85. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/NL3FK2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd8f8c9f367b5362325d7158a7cb8e94937d6047e5fcc99621d27908fd065e61e. Chain 2 (Bitcoin): anchored in block 956474 (2026-07-03T08:56:35Z), 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/NL3FK2400001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0bd548decdc10ac3d62e146767258319a94dec7992ddcc0f79ec3d7460df4e4. Chain 2 (Bitcoin): anchored in block 956725 (2026-07-05T01:12:41Z), 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/NL3FK2400002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x60ed03f6229b02e10ef32a9f56de6beeef85eba5848c1a7c4650b30153e13c87. Chain 2 (Bitcoin): anchored in block 956484 (2026-07-03T10:47:44Z), 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/NL3FK2400005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac8aa30ba78ce5f93e1d56576f3490a780ffeda6f01a93d16d1350699417db85. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NL3FK2400009.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf51dea5a0dcf70c468dcbc8aa6202dd4f5ea44cd07d66494090b09a32ef96f00. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/NL3FK2400013.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc8328c7b8d8d2bf5bb0f93cac34f4c9c21665a71747b9e85bff0edef9399154d. Chain 2 (Bitcoin): anchored in block 958517 (2026-07-18T07:54:29Z), 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/NL3FK2400004.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8de9b8355d0b73f61111f7775a969f4c333cceda53602d151b7d528e72244b6. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/NL3FK2400003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5276ecd9e7c3af48ddea58544073dd326053f604c0dacaef276894494fd1b932. Chain 2 (Bitcoin): anchored in block 956891 (2026-07-06T07:16:32Z), 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/NL3FK2400011.