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 0x889b8b322f44aa4834021db18b8ec2a9efa39d732e7b88a0d7e8f25c21931af1. Chain 2 (Bitcoin): anchored in block 954693 (2026-06-21T11:50:32Z). Bridge: the canonical record inside this Bitcoin proof contains the same CopyrightID. Verify: download https://artists.proofprofile.net/proofs/artist/e9c166fa-071e-4dd7-996a-de0f4438e404.json and https://artists.proofprofile.net/proofs/artist/e9c166fa-071e-4dd7-996a-de0f4438e404.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 0x8168f5d663c271c3bcaee47e901a76a9fdaa9ccffa6bd8e72d0ca32de0f4512e. Chain 2 (Bitcoin): anchored in block 960362 (2026-07-31T06:58:00Z), 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/FIBAR0900034.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf7164eeb5d41f578b440d7e84f49f2cf83bd61b34164b37dedddadc94b5c968. Chain 2 (Bitcoin): anchored in block 960459 (2026-07-31T20:22:46Z), 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/FIBAR0900108.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2e86a3287a626cc13ce7155c16d6a13b883ab09a8a04c0150438ffc39839b4f3. Chain 2 (Bitcoin): anchored in block 960422 (2026-07-31T15:27:29Z), 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/FIBAR0900109.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x272fbd0fc97fdeb16c2078761a5914750e20e7d2e060ae95c35c85bea69077df. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIBAR0900110.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x152147cf46a4b3a73ffa6d62b7aab734801268c1bffea804d0ee49523ce80a8d. 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/FIBAR0800251.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2dd24ddb7dd69e1e7c5107616a5d398490005394a090cdb1daca224eecaae15d. 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/FIBAR0900116.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x896a0a208c8ab51609ee938cabc26473992b7b4e8f1c53abdbe249026a178132. Chain 2 (Bitcoin): anchored in block 957067 (2026-07-07T16:54:37Z), 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/FIBAR0400201.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe76c0c08da811a5823d300d22b8645ba0cb618a564a77b7e0a8afeb1c745267f. 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/FIBAR0400204.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb2f3663f65eb0662092a9f1efa3e9e537d9fb6342b24ce4805ea3231c058c7c0. Chain 2 (Bitcoin): anchored in block 960481 (2026-07-31T23:51:35Z), 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/FIBAR0400205.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xfdd6b01f6f725c42b88f79144a051ade770ab8ade81ad9acf311927b0492720d. 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/FIBAR0400210.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab803107d750c1bacef99c1abe04107b9908117b092c9c276f278c0dd8e4a3d. Chain 2 (Bitcoin): anchored in block 960348 (2026-07-31T05:17:02Z), 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/FIBAR0400211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xab05dc6ea8cc45741a527c5922a765dc7a82299fa697e342224ea10f561a4913. 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/FIARA9600089.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x313f62eae7a540de8f81fa339b630b448963dd73be6a01422d66ab97e1582879. 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/FIBAR0700451.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab803107d750c1bacef99c1abe04107b9908117b092c9c276f278c0dd8e4a3d. Chain 2 (Bitcoin): anchored in block 960360 (2026-07-31T06:42:11Z), 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/FIBAR0400211.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc747679632d30955f1548360588cef3f3fdd4019f9249e97ffe57dc3b88cfebf. 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/FIBAR8800103.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x62e1d18b2eb8dc851941075b4a8f91879936cdadbcd54c10a9e8626049b4896d. 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/FIBAR9900232.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf64f2d558cc609a215fd0211b326670d1df7f7c0ebd4099430457acfeb686e34. Chain 2 (Bitcoin): anchored in block 960468 (2026-07-31T21:25:57Z), 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/FIBAR0200322.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x45be9e5edd7679203bb2e5cd0b42a9ca52f3db864d1161b1dabfedc084fd6ee6. Chain 2 (Bitcoin): anchored in block 960500 (2026-08-01T03:13:03Z), 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/FIEMS9200707.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3bcd3e931d97075b5c3f0e0a2eb980bf40ca9ec30a3eca552decebf20e368b5e. Chain 2 (Bitcoin): anchored in block 960463 (2026-07-31T20:42:35Z), 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/FIBAR0400206.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3af4163d60de8e8b28a830561ee64732ee4f983d139aa323f249a7204c604440. Chain 2 (Bitcoin): anchored in block 960291 (2026-07-30T18:23:33Z), 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/FIBAR9000020.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x49c1e3bc22210e819638be0e6c822462132ad007bd871e81025d8f841bd48756. Chain 2 (Bitcoin): anchored in block 960207 (2026-07-30T04:47:22Z), 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/FIBAR0500125.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ab803107d750c1bacef99c1abe04107b9908117b092c9c276f278c0dd8e4a3d. Chain 2 (Bitcoin): anchored in block 960441 (2026-07-31T17:29:52Z), 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/FIBAR0400211.