upright=1.5|thumb|Large menhir located between Millstreet and Ballinagree, County Cork, Ireland thumb|The Caramujeira Menhir, currently preserved at the Silves Municipal Archeology Museum, in Portugal
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 0x521723e55e7a8adea038d6e815c955b54e660ec33372f0f051b030ffa20ece62. Chain 2 (Bitcoin): anchored in block 953770 (2026-06-15T09:50:11Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/b0875d8f-eba4-4976-b94e-5659d6de38a3.json and https://artists.proofprofile.net/proofs/artist/b0875d8f-eba4-4976-b94e-5659d6de38a3.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 0x11d7106644d4a631bfe39e7b4320d555ab2104de26905e495bbc865fb0954560. 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/IT0CF1400072.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe8db00e07a06afee68aee7cbed5897a9762c3a9399130eef0d68c41d75b389ba. Chain 2 (Bitcoin): anchored in block 956349 (2026-07-02T11:34:59Z), 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/IT0CF1400073.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbce0856619f34534098fd1cf87a87501381a209b50d7a56c5762f597db7e71a2. 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/IT0CF1400075.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf0406efc1f7193d0704c94beb8481d4b1a4f798b00a0e97b60c5cedd3c6b471. 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/IT0CF1400076.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdbc18efdef057a5def425cf4e112a84b9a20a9bfe436c31d435c64d479a35a4. 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/IT0CF1400078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8258a2eac0b4da9bf993f8c4c0621f4bcd255b94aa0ebffccc08c0c76e8ae26c. 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/IT0CF1400079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5dc9cb0b2433c56e999e2fd9d780c4ec72ef5b13c1d47d113747938ae3060b5b. 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/IT0CF1400082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1e853cdf24404cbd51ab79a609637f793c3ac9dbb1f5c85ea5d1f1bf77e2726. 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/IT0CF1400094.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7c841303b438540916446851487db6d765861aaa0bae42715615f9b9f677d78b. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T20:59:05Z), 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/IT0CF1400074.
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 0x703dcd10eb11d71f449f1d5297cc929794ca2565e462da30da9a5b6f4b86d5be. Chain 2 (Bitcoin): anchored in block 960494 (2026-08-01T01:44:32Z), 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/IT0CF1400071.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x19ceabed93b5ba64b89bc0c30a1ab59fd4442af8a48e232b1b3ebdc5f051f9e1. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/IT0CF1400077.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x47058587754fd90677608d36fb2c9ffd995342585db05f249570a454849105cd. Chain 2 (Bitcoin): anchored in block 960344 (2026-07-31T04:14:58Z), 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/IT0CF1400080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf62c84e48cee3620a9260c7158404ba6c5f80a22708934dbd2b84c7bbe18fa38. 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/IT0CF1400081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x42087b206d0121222fcbe3aff83a053e8316ceebb06d445f8cc9e296eba5cd41. Chain 2 (Bitcoin): anchored in block 957244 (2026-07-09T01:44:02Z), 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/FR6V80719943.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3473e1395718be0fa2afabbe981bfa3c01b76b77e51803084434a3db709adf18. 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/FR6V80719944.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1e0712fb6599521c9fcfe46ef0bc06fd304eb7bd3eff94ed49383724775872d1. 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/FR6V80719946.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5077e1fa4abbc2d5f0142c716160cd5393ce97a3f13d79020e0900d618504e24. Chain 2 (Bitcoin): anchored in block 957122 (2026-07-08T03:39:04Z), 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/FR6V80719947.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1593c3d97a6b3006bbcbaf4806434c2c9b8719ebb134d4283640553005226468. 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/FR6V80719950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x91f1649cc84ed9c78708be24d5b99b1b6f5c8080233ea61889ed1b849daf0805. 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/FR6V80719952.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7e6a9a046a83f567279c6c739b2efcaf5be7fcef4328989f90fdf0daa79701c7. 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/FR6V80719953.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x201197fc4614dd6b0bb463506b44499c27f70c32fdca5eba99eb0cbb9e881249. 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/FR6V80719955.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x545c1ff55eb815b6b25c0f66532607e428b2f3f9863b67c12f53d765c1bdd28c. Chain 2 (Bitcoin): anchored in block 960317 (2026-07-30T21:35:24Z), 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/FR6V80719945.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5167bf5a9f99ddc4b3235183c6793be0b861aafa181c5742217bc592f6e94ad4. Chain 2 (Bitcoin): anchored in block 960337 (2026-07-31T02:51:48Z), 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/FR6V80719951.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc2e3a379f3feb3080ddd0707b50a23fb5e6efbea5d70490f06eec9bfce390289. 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/FR6V80719956.