thumb|Statue of the angel of the Annunciation, , Metropolitan Museum of Art thumb|right|Schutzengel ("Guardian angel") by Bernhard Plockhorst depicts a guardian angel watching over two children. thumb
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 0xf620c53b9e430e599637efcfe41df6f473710b0b5a6fba7f7ab8ad5f86cf944d. 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/de083338-a505-4a13-a6f4-f492ab0c836c.json and https://artists.proofprofile.net/proofs/artist/de083338-a505-4a13-a6f4-f492ab0c836c.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 0xea2cae95745a29c2f706f2aa5afdbc965c896df15f86a84608ead632a2749ed0. 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/USDJ20200759.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x645d33a9db6b5af531374d082ffe8b38fb89a7a909a5b09969f44a493e2a56fc. Chain 2 (Bitcoin): anchored in block 958436 (2026-07-17T16:42:22Z), 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/USDJ20200760.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2c7039d4a625e5f9c55337a11c64fd61a9c2f9c332ca34d38864264e5611e7. Chain 2 (Bitcoin): anchored in block 959087 (2026-07-22T04:32:26Z), 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/USDJ20200767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd1049f737777e5da54a0144d810e00f8e1cfb54989014a0bf47f1b5bc09a781c. Chain 2 (Bitcoin): anchored in block 958212 (2026-07-15T23:25:50Z), 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/USIR20200714.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb79651846be9bab8cc4e5514cce2cb3e52a6bfe83334ee738b3decbb6ba163fd. Chain 2 (Bitcoin): anchored in block 959047 (2026-07-21T20:47:04Z), 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/USUM70811841.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x1064ff7cdd1451af3a54dd49c288989bbdee2704040b304e2ae1c5b0bf9dc38a. Chain 2 (Bitcoin): anchored in block 958788 (2026-07-19T22:07:06Z), 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/USDJ20200787.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7d89ce8439fc547bc3e2e3c4b9fb431b8359e996f2b9325aaeba0dbcd254f1a2. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USUM70811839.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6266caa5e38ad1e8137fa2d18ff8d70c44f8ea220426d1aa61e23a8ab05b9770. Chain 2 (Bitcoin): anchored in block 958959 (2026-07-21T03:51:22Z), 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/USDJ20200776.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3946c6b8b502be97a63b1731d8f5b09a707899e3c23af32ab5eb39461dc09f72. Chain 2 (Bitcoin): anchored in block 959037 (2026-07-21T16:59:47Z), 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/USDJ20200777.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x6e852ebfa9a3370caf36530da419c76c003a25c89045e5b10271804d475cc791. Chain 2 (Bitcoin): anchored in block 958911 (2026-07-20T19:28:54Z), 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/USDJ20200779.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3032d68c1aa76fb2f23068c795442f51f34871a2d5ea1455350b590d8e4e5486. Chain 2 (Bitcoin): anchored in block 958942 (2026-07-21T00:24:07Z), 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/USDJ20200784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xcef42c982850f4ff8a6ae64f39de92ed92a25036ddf6d900efb99b26351a53de. 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/USDJ20200788.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x547ba17e892413201a13f7096b13702a5fda8fc524a99d67500bc7cef61abfb0. Chain 2 (Bitcoin): anchored in block 958907 (2026-07-20T19:04:05Z), 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/USUM70501180.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x447bb94242c74c53126aaf69f9122fdf60bdac4ac99f15ee5a4067047c95d987. 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/USDJ20200789.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf724f56c8fb38c76abb7eee0ef49d312bf21a7d04d3d2d501536d5c489c7a4eb. 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/USDJ20200792.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4236b3ac4570c4da1e1448bcf5c39530a3dd91c66181090640acc1ec142c7a14. Chain 2 (Bitcoin): anchored in block 958908 (2026-07-20T19:06:46Z), 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/USDJ20200758.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xeae75cd1fdc9a3c4e28540ce6de845d5856f8dab11a8e1f2be73cd1517f2d41b. Chain 2 (Bitcoin): anchored in block 956826 (2026-07-05T19:27:56Z), 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/USDJ20200775.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5b2c7039d4a625e5f9c55337a11c64fd61a9c2f9c332ca34d38864264e5611e7. Chain 2 (Bitcoin): anchored in block 958951 (2026-07-21T04:29:32Z), 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/USDJ20200767.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3032d68c1aa76fb2f23068c795442f51f34871a2d5ea1455350b590d8e4e5486. Chain 2 (Bitcoin): anchored in block 958204 (2026-07-16T00:27:30Z), 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/USDJ20200784.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa03bfded0345fc6cc3cdad9e183d1fad50c8fd680abec12f65426e50b3e1cdd7. 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/USDJ20200782.