right|thumb|270px|Yufu City Hall is a city in Ōita Prefecture. , the city had an estimated population of 33,556 in 15883 households, and a population density of 110 persons per km2. The total area
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 0xf3255806761e309ef6e5421f3ff79dad47aad4055cb8a68801ac7e3bb9177e84. 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/13b08d53-2a07-41c3-b40e-5d5a77961d86.json and https://artists.proofprofile.net/proofs/artist/13b08d53-2a07-41c3-b40e-5d5a77961d86.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 0x6b6140db5839b1cc27aaac76c3956dd57a97f53c3f7c28c23d40c309d3862b1b. 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/DGA0L2374325.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x107541b2abc958ff1358fda8631af6d2ce28624c02b1c985f5411b15938c5f50. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/DGA0L2374326.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc91f64ac6df29eb46ff7dcd0427783a56fdffad5e701a621417f166fe8d0105d. Chain 2 (Bitcoin): anchored in block 958228 (2026-07-16T05:21:45Z), 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/US3F72411161.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa020a12aaa5e71d7e865e09da7eebc798db85e60a0266aeb7b1dcc94f1f820d2. Chain 2 (Bitcoin): anchored in block 956620 (2026-07-04T07:11:13Z), 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/US3F72411162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x826579819c9f43c2f1d4535b9f3042acb1a4839418167cc26027adddc4d9845e. Chain 2 (Bitcoin): anchored in block 958180 (2026-07-15T20:12:35Z), 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/US3F72411163.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd05591d9f221152eadd59802ede0d401a82b3e7c1010535a1bd46fdf63b596a. 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/US3F72411165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a676a65caf00ad3625fbc4a31ebe50be9929ab56f16735317f43598d6f4f5f0. Chain 2 (Bitcoin): anchored in block 958541 (2026-07-18T11:37:54Z), 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/US3F72411166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcaca5ed1dc4591ac372ae5305039ecc180f6d94371d8d3f25833bc483fe7a1ec. Chain 2 (Bitcoin): anchored in block 957770 (2026-07-12T23:17:00Z), 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/US3F72411156.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70651b5fbec98d6b7ca0b5b616b5c8e42ea710353347fd9891f58724ccd99350. Chain 2 (Bitcoin): anchored in block 956790 (2026-07-05T12:31:54Z), 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/US3F72411167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe131f96fb0c706048c198de1b5a878464a80d739389516565f694e87b7688deb. Chain 2 (Bitcoin): anchored in block 958373 (2026-07-17T06:09:33Z), 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/US3F72411168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b3f5970482ca08523e33555c39b8ed7df3c944feb9a320b4592df5388efc2e. 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/US3F72411169.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe131f96fb0c706048c198de1b5a878464a80d739389516565f694e87b7688deb. Chain 2 (Bitcoin): anchored in block 958054 (2026-07-14T19:33:24Z), 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/US3F72411168.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa020a12aaa5e71d7e865e09da7eebc798db85e60a0266aeb7b1dcc94f1f820d2. 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/US3F72411162.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcd05591d9f221152eadd59802ede0d401a82b3e7c1010535a1bd46fdf63b596a. Chain 2 (Bitcoin): anchored in block 956560 (2026-07-03T23:28:02Z), 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/US3F72411165.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2a676a65caf00ad3625fbc4a31ebe50be9929ab56f16735317f43598d6f4f5f0. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-16T00:25:59Z), 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/US3F72411166.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70651b5fbec98d6b7ca0b5b616b5c8e42ea710353347fd9891f58724ccd99350. Chain 2 (Bitcoin): anchored in block 956634 (2026-07-04T10:04:33Z), 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/US3F72411167.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa3b3f5970482ca08523e33555c39b8ed7df3c944feb9a320b4592df5388efc2e. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/US3F72411169.