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 0xe387968270a32b9a421be9137a584e5ba97476d5d8ade4075e17331cfab3ab25. 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/a6a32d93-ae20-4da6-b4c4-13fb2e583f4f.json and https://artists.proofprofile.net/proofs/artist/a6a32d93-ae20-4da6-b4c4-13fb2e583f4f.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 0x4ab3813f25389f7b143a6e1b1038ba66c3ce63f607c4b8854036af68514a5d5b. 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/BKF442500011.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe17e4266ee50e87eb6b95e42b4f3e5b9223e9670aa6f7845802579e7e522cf88. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/BC3PG2501608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9b91a0193a57029e8f85cae04c1ab78942857141da9a25ed7b34700193d70972. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKF442500035.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dd11f38245947b9f66848fdfb20262a602f2fd0ab3f63c64371ecfa1b159e0a. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/BC3PG2501528.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b46e4c778d27e840118f50165996d7f91bf6ce8a7163f4da82c17b53d11855c. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BKF442500037.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x986cac8f73685b9d06914e553fa827ea0cb47d43873276658ca166cdf0e913ec. Chain 2 (Bitcoin): anchored in block 953528 (2026-06-13T15:41:10Z), 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/BKF442500036.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xec86daeb1c54557a99e36921e876c211078b3815e7f207b7f53b6431b6689621. 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/BC3PG2501445.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x81c7401cf152afeb9b458aa8fd1db6e323c7ad5899a931fbdee449204ab69f3e. Chain 2 (Bitcoin): anchored in block 956302 (2026-07-02T03:30:09Z), 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/QZNJV2503837.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x345281bf412fb5b9094eb4a3df8c12e374fc9ff0323c560bf4bb297990b214e5. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BKF442500127.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf805ac9fd49d7ac8b24c15df37ea16ed29a6f0189bdda620abd73f6668a29864. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BK89N2500120.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x93153a352c3f0c2053e5510dcc362a9380a6983ce299af7fadc007d1f81445e1. Chain 2 (Bitcoin): anchored in block 960429 (2026-07-31T16:07:24Z), 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/BXKG22500556.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfde9a36402b3966cf4db9310689619ba6bf0ba671411e7f920baf5ee0934d350. 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/QZMZ92573290.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xae7b0db288f8bf4185acc93085c3d6b1a2c7a4905b30a008a52a793338bb23bc. 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/BKYOU2500048.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xee810410ae795ad341a78ac4a93b533ddabcb0f04614dc3545ea4d09b59aa577. Chain 2 (Bitcoin): anchored in block 953520 (2026-06-13T13:32:09Z), 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/BKF442400292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5a5deb24b8f7a23d9bc19ac345410dcd87f5b3b6407efe82d22601c9769a5b90. Chain 2 (Bitcoin): anchored in block 956304 (2026-07-02T03:55:08Z), 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/BKYOU2500044.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2b946bbfa77b329ab78110454c952a47cdce40fe73f2bc570469a523849fe6f8. Chain 2 (Bitcoin): anchored in block 960327 (2026-07-31T00:26:26Z), 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/BC3PG2501195.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf18a147b276ad12dbb0241bd654c323b863f1f1a2d504d315b42beb90eca3d1a. Chain 2 (Bitcoin): anchored in block 953515 (2026-06-13T12:53:06Z), 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/QZNJZ2419066.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x20ae0b1a1bdd69a149029f69264c7c6a991696c9bee024ea787f8f983b05551e. 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/BK2242400693.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa2137dbf94e839bc3f429b70786313d8b33adb5e9272911e78df8aea8292f392. Chain 2 (Bitcoin): anchored in block 960160 (2026-07-29T22:48:59Z), 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/BC3PG2402469.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x92a2bfd57a22733695b812577f15857aa1977e799fc685952d608ca7d10d14cd. 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/BC3PG2401617.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xac2df72aac7b1781d98c6688927401e52c2ed7cfb5bd44bdb504882842ea6b7c. 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/BC3PG2402636.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x70739a2b076192122e013e7d3d39ad8b2af9d704c51fdce7bd419c6bba867ccd. Chain 2 (Bitcoin): anchored in block 960418 (2026-07-31T15:20:15Z), 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/QZTVM2473292.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x037b05eb04779b06157ee62b0e65fc5b1baa9d50d14f4242cc00028c4a0ab399. 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/BC3PG2500372.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x716330c8175998b509c785ad3c2fc85a0edfcaea85cd6b4518bca8be157bda39. Chain 2 (Bitcoin): anchored in block 953513 (2026-06-13T12:47:07Z), 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/BKF442400142.