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 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 0xb1e90f57ab606c12724ade8e2cf0eba0c98cdd071a3426602bf1899345c0f921. 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/d51e48b8-d728-42f1-acbc-9c548a950e04.json and https://artists.proofprofile.net/proofs/artist/d51e48b8-d728-42f1-acbc-9c548a950e04.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 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 0x0091667a7c28287b59aaea07294c718f2d13259131395a2029d7d60cb99fcf07. Chain 2 (Bitcoin): anchored in block 958876 (2026-07-20T12:15:48Z), 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/ATV110569001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfedf20f6b448e62720a6d4af6ef9f8ce6503b507fe3fc0edc5faaa32bf3a50b8. Chain 2 (Bitcoin): anchored in block 958203 (2026-07-15T21:24:46Z), 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/ATV110569002.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x649a2073491e5bb1b330ec0d7dabf892861ace6d2fc10f85c8ab29680d82acd4. Chain 2 (Bitcoin): anchored in block 959023 (2026-07-21T15:22:58Z), 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/ATV110569003.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x27c0172d9abe50e3e780ec12a17459f358d86ed2aa2289912f29e278560180e6. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T10:20:17Z), 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/ATV110569008.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x25c2a4bcef734de0eefbd5b9907ae2ab7a3659cbe5d0a2cba4d0a929b3f0db06. Chain 2 (Bitcoin): anchored in block 959013 (2026-07-21T13:39:11Z), 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/ATV110569014.
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Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb9ddaabd00c76a5164c6e68b92c225030b75d09bfb34a9c8a736e385fba7f63. Chain 2 (Bitcoin): anchored in block 959100 (2026-07-22T05:29:55Z), 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/ATV110400120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcc59668469bdfda62643bcb96bdf6dbd641b8f15b3fd900e534a19eeff1ed3c8. Chain 2 (Bitcoin): anchored in block 959107 (2026-07-22T07:19:23Z), 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/ATV110760001.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x888f4c1e0df8b701172c2dbdd0f17b7cd9df0488d8e26283a88054ead44efb64. 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/ATV110760005.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x975cf86529cd060e46f2c4313a54f9114292b1d3e42c760a68f60a35614b064c. Chain 2 (Bitcoin): anchored in block 957880 (2026-07-13T16:39:18Z), 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/ATT250808950.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbc29b2f66e9e08a192879cbd8ffc61ab7ef2dea0a873dd527502cc24d9861fbb. Chain 2 (Bitcoin): anchored in block 959096 (2026-07-22T03:48:36Z), 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/ATT251006990.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6195d7ee524c2dbfed5f1e0d91d3bc0bf3e13febe1471d2984c351283f0b68eb. Chain 2 (Bitcoin): anchored in block 956822 (2026-07-05T18:48:28Z), 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/ATT251007000.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x488a91a55db93ace648416a3d75cf9c15ac4faec4f12d8ce799e81e4281932dd. Chain 2 (Bitcoin): anchored in block 956856 (2026-07-06T01:25:57Z), 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/ATT251007010.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xed54bdd7f7afc176ed8eebdc2dadd001692d2ff8236bd2ba6befe63b443f6269. Chain 2 (Bitcoin): anchored in block 958157 (2026-07-15T13:14:32Z), 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/ATH931247402.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9a8a9a2f10f8e94371fd2a38ad2f725d23b8dd005d165a82826c213c727d5949. Chain 2 (Bitcoin): anchored in block 958444 (2026-07-17T19:12:23Z), 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/ATH931750302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c79ff300a6f1f90841f3053d8881a785636dc92eb1d31f725897cfce136b350. Chain 2 (Bitcoin): anchored in block 958607 (2026-07-18T21:01:11Z), 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/ATH931750303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xba96117a41bcfdf6d16bce1982493e7f26cba803131b2bbf985329cefd53e660. Chain 2 (Bitcoin): anchored in block 956396 (2026-07-02T21:01:51Z), 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/ATH931750307.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x07212ffc90e79d574da2184f25e73ce9c153133014a6d1b7f34d19822eaa9e31. 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/ATH931750311.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e9ab1cb42a0d646a85a8a3da12d455818d2e4325b36d9fddf7b04711c068333. Chain 2 (Bitcoin): anchored in block 958251 (2026-07-16T06:29:25Z), 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/ATH932252202.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0c74b5a6c695cdd61b67cf94082e75013613ae7ac57372211ff196a39135ff4f. 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/ATH932252203.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cfdc3c52e4941e18da4747ab03dc6b71465622a614c668d0e9aef07a24dbe52. Chain 2 (Bitcoin): anchored in block 958935 (2026-07-20T22:08:19Z), 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/ATH932252205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a933b75b9ef075713b13fd0e4433baf4bf4f7ffdb21a3400035295a4c0f46b6. Chain 2 (Bitcoin): anchored in block 958340 (2026-07-17T00:53:26Z), 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/ATH932252207.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae8a4cb68edc321f164d423acaeb77c9b2ba6b58f5f5ac86cd5fa67639f8a637. Chain 2 (Bitcoin): anchored in block 959069 (2026-07-21T22:32:59Z), 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/ATH932252212.