thumb|Map of south-eastern England showing places visited by king Aelle (477) __NOTOC__ Year 477 (CDLXXVII) was a common year starting on Saturday of the Julian calendar. At the time, it was known as
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 0x337ee81ee2ecb6d61f3a533bc1ea9a382761cb75be3a6b808a7c1a5c2e3f2c99. 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/58eedf26-3015-411f-a42b-ae346e33db70.json and https://artists.proofprofile.net/proofs/artist/58eedf26-3015-411f-a42b-ae346e33db70.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 0xe079a217f7545a2ea4c4d8f595e5ef43b57a9e2c5fdf40ab98e9953923dd08b1. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAEP2093200.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf945bdc027ca6e1dfb9cff62274f0f2638c90c05ed91d011c9961707ed2b1129. Chain 2 (Bitcoin): anchored in block 958834 (2026-07-20T05:55:47Z), 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/TCAGD2277994.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07f63c5c649875a55a140f0ae97a035e10365f4cfbf86faacc169957daa9ad97. 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/TCAGP2217830.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad437e559e00be9018b163d3dcb056a0a1a1b4b2739fa2a0934d22e362de8eed. Chain 2 (Bitcoin): anchored in block 956772 (2026-07-05T10:01:46Z), 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/TCAHQ2320024.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x84dffdf9cc33f1c4b190326c30fa19a7a3c940a8fa92b59270a0ecab1c1b596f. 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/TCAHQ2320295.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0f005138c5ed924a322f379ebbfe9163496f8ffdfa5f2bda0a6b4baa0ca08943. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/TCAIP2462976.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb6d1c33a74ef4f7e58ec3b1f40a008531a3afce476fbe82bc021266e65a77fbf. Chain 2 (Bitcoin): anchored in block 958350 (2026-07-17T04:55:13Z), 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/TCAIO2463110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cab118a235a805a3917e64ba251e23db934998b0bad54d1d53c2ba6f8daca04. Chain 2 (Bitcoin): anchored in block 958846 (2026-07-20T08:14:15Z), 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/QT6622551666.