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 0xf9ade57ab3d034012eeb9d92e8f394ac96339d306c60741c4fb79d05f0736ebf. Chain 2 (Bitcoin): anchored in block 954066 (2026-06-17T08:11:48Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/67038a8d-a8c0-4e42-8e71-df8c8ca012cd.json and https://artists.proofprofile.net/proofs/artist/67038a8d-a8c0-4e42-8e71-df8c8ca012cd.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 0xf5aa9b7d3056f38119fdcf675fd78344756937b9629c2d24a333f4859eb02416. Chain 2 (Bitcoin): anchored in block 960099 (2026-07-29T11:30:20Z), 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/QZW9L2399078.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xff081026afc6a4acefb93f4eb7970b10d6fb4fdb5447fa7d5ae17edb9dd27d99. Chain 2 (Bitcoin): anchored in block 960138 (2026-07-29T19:35:34Z), 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/QZW9L2399079.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7ff0d11dc7249aded47b9f09a9818ea465e5a675fd9b4229271b27e808878c24. Chain 2 (Bitcoin): anchored in block 960240 (2026-07-30T09:57:33Z), 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/QZW9L2399080.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa16cd40ec13e8ccc6d418578ec7a1bbac2f065c618fa2cfe38604fd69f032570. 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/QZW9L2399081.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x56e3167d5c3d1af25a20cab0491f1fe18a1cab7785280dde7bac068c1a6f1be3. Chain 2 (Bitcoin): anchored in block 960288 (2026-07-30T17:41:38Z), 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/QZW9L2399082.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf6ab16085fefca08273237746a4801d9ada97890a7e6c55fd927376ca1bec47a. 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/QZW9L2399083.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8430a65f1f075241e6202fc55e0050c4d5e2ebaaeaf570d9ed6a6aed7f24d742. Chain 2 (Bitcoin): anchored in block 957011 (2026-07-07T08:25:35Z), 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/QZW9L2399084.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1f1d2c0cd6c14ce9d9b904eed11a0c3067757ca0d23f46b02c969ca780b059ce. 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/QZW9L2399085.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1b30076eebd81609034b688e5e099a50ec1b2e18bdc2ee9f0fb48b12b702e7c9. Chain 2 (Bitcoin): anchored in block 960095 (2026-07-29T11:07:37Z), 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/QZW9L2399086.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x001f3eadedb7e1d7d2151ddccbf02b01c79bd0b6b92ed3d44cb0423cc45fc6ed. 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/QZW9L2399087.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd4a75d6e2824420fc155f757575ed08de0dc36570d8564b6dc103a622630ae6c. 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/QZGLS2321826.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb5ea230ef393c3e654876d4480719de9f6078168a2d3a0e7cc8024af1b760981. Chain 2 (Bitcoin): anchored in block 960294 (2026-07-30T18:46:00Z), 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/QZTPX2325385.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x937f267eac1b90345c9668621190b0a24bcd26b3d7b374e02eadf57d5b0b4709. Chain 2 (Bitcoin): anchored in block 960321 (2026-07-30T22:27:30Z), 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/QZGLM2349034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xda0de3f6d12bdd0c18867edbab97b41e66fa6f20d3af93f2aa27ff0e13354440. 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/TCAFX2114603.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x54b1fac55f876c28b0716cdf35bd9a6b7131b8980df557cea1b439bf215fbd76. Chain 2 (Bitcoin): anchored in block 959134 (2026-07-22T13:34:27Z), 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/TCAFX2114620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0846d5a9e4c6e421abe5c3bf8683a8362acf575775e653cc987baf52569f6177. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/TCAFX2114625.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x227e0129262b892ed98ac5b826349f68cf74d1ea039620be563283c62081ebec. 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/TCAFX2114631.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x48ca03c65ba7a6c9604059c0d1f0e21c37365f9a4560022b142dd410b4842803. 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/TCAFX2114654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x8628f359c98e175c32affb32eb624bfa14f00374924da3f27a169b1d1d897f17. 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/TCAFX2114664.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x80f1bb100d956cce8f8afd06c2367090151406cde3ef72e7ed65a80fec2a971a. 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/TCAFX2114671.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6082ced10f1320f8219c9fcb6593f43da8200f195d78a9245d34f5546ef94d07. 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/TCAFX2114674.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x85dac7496f5cb559164542a2dafb4e56e01cc3dce408e2ca0d5877968996e8f6. 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/TCAFX2114677.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0fc64e644863418196c7843ee85e79ea10c9837a82943c4357754d8182c58259. 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/TCAFX2114681.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3f0bcc91f5e0ec687816bbd77b9979ea372d3d3ceba6bec0c4b4d6f2858abddc. 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/TCAFX2114688.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3e15f32c2af519ec271d4cbf3b4926717747425593084c87384ada6b8ba2c418. 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/TCAFX2114689.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e0740e29a6531901ea0dd46e3730c4d8f03a1777de4650cf3e1077e4dcb1f56. 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/TCAFX2114696.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58e47dc9caa49abbf9da6ee781d1f0abf5c422d3b9c68f66a159a4b1f66fafd7. 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/TCAFX2114700.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6b5b4c93db5264202a1f61ea0f3c4a3563c23afbdf115b776960ad187c0be25. 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/TCAFX2114704.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x517eb72e3d15d3ca70f5e3be75a101d38d82329bae334fb35ce371b4ad0eb15e. 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/TCAFX2114712.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x18a53336ebc5f0a431f194ca265754d45790e8058f987d6f8498028c30bcf82c. 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/QZZ782452884.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeb54f431fd252d976c79f5dfdca3c47fa30cd120afe28e251b91575ac15bfb2c. Chain 2 (Bitcoin): anchored in block 960368 (2026-07-31T08:26:41Z), 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/QZZ782452886.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4bd674585f25daeb213875a397465d81ec9c11b294f20592273a0a22e4c8748d. 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/QZZ782452888.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe6222b985a33084142c02a1e457d6ff9f16c0e28371bf02a5f8bfd6395d081eb. 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/QZZ782452889.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x24946daf12464cdbf645da5caaa7290743e767e83093fbc4fc0f52b5934061cf. 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/QZZ782452890.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa98164adfd81a45262091e9336438fcb25784023adfd81dea13ba2ed55b3ca92. Chain 2 (Bitcoin): anchored in block 959163 (2026-07-22T18:47:29Z), 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/QZZ782452893.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf13f79634c5c2a5a8734d74bfa597a6ca016da7f78109a7e822bd0d3614826f. 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/QZMEN2474229.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6abc70ac5f692f5b57a63fda8985c4c5711cc190d0b6f450481ab8de208aeafb. 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/QZWDE2435654.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x489809bdea899b1fdb1dd4a4ed3d76273bcac86e144c5ccd0f90f26dd3dde1cb. Chain 2 (Bitcoin): anchored in block 960478 (2026-07-31T23:30:38Z), 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/QZHN82122472.