The Williams Brothers featuring Andy Williams were a singing quartet formed in the mid-1930s. They initially entertained on radio stations and later appeared in four musical films in the 1940s. After
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 0x688c87271b542ba832b170b4a8957fda2a8ca700862bdbf66e80d7be936eadad. 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/1b3c7d28-d48f-4c81-bff2-b9661d408559.json and https://artists.proofprofile.net/proofs/artist/1b3c7d28-d48f-4c81-bff2-b9661d408559.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 0x29e59aae488c143d308d7325cd3b0aa32a12e87d5f570996bbf3d24062646515. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QM6P41592454.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9c07ab29fdf1d87c663874d32a1e90ceff151dbee25e6ca07e90d1d2b2fc81ab. 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/QM6P41592456.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb506cf589e98592bac9b5ce128a2db62f9642332d16a50cd22fba843b554e03e. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM6P41592461.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x71039f6f6312528eb9b670710e360b6c08b553501031850dc2cd0e6996fca30b. Chain 2 (Bitcoin): anchored in block 958276 (2026-07-16T12:36:01Z), 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/USMR50440604.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xaf4c34592f94d11fdfe4809e1caec3a876a91ce7544b6cbd660b261c9de21a4d. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/USMR50440608.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5cee1f42ab0f1cf42d966d7a67bda0ce0c3e2b3d0c395176eb04f46c2d93a40c. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USMR50440614.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa585ffada2316f05cbdb27566081067c0de8c867bf663157548ad60ac9788186. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/USMR50440620.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf4753c3621652fc57da5d854be4bdd2870811af108588011dd547ca6f7447ee5. Chain 2 (Bitcoin): anchored in block 956545 (2026-07-03T19:59:51Z), 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/USI4R0808439.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xbf13d2e591a995d795b906d7a3583352753ffdc4d2fa43220dca5d41981e15e7. Chain 2 (Bitcoin): anchored in block 958508 (2026-07-18T06:27:01Z), 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/USI4R0807315.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x0309225d88ac00338e13b54ad5b866a7cd6ff6a3fd373d3e2fbecef30d29e4ef. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USI4R0807316.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb16212b99db8ac29ad2cba0b48856208ef0b43b66292502599dbd3153ad58706. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USI4R0807317.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x75c7e57ffd2c9a561ce175775fbd99ef04776ec436f8d60a1fa96cbb285195f4. Chain 2 (Bitcoin): anchored in block 958216 (2026-07-16T00:00:34Z), 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/USI4R0807293.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x2db6fd89b0b85ad57dd0e3ca2460e3c33c9a5fe3acc0089e4ea8c7053d5ed4da. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USI4R0807296.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc62d4a83a81b106b30c5a917ea3bd4b12d7af72acfaf72d1feb73f903e5f777e. Chain 2 (Bitcoin): anchored in block 956576 (2026-07-04T02:06:47Z), 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/USI4R0807297.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x793b8ce461573b86ab3a9f811ec5038c5e7cd768fe9d71a99ee5ff82952e119a. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/USI4R0807298.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xf964ee5f75648b98be4ba3c5fdaa716926a75c21817ba91663fec7a7c994c4a4. Chain 2 (Bitcoin): anchored in block 956375 (2026-07-02T16:51:38Z), 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/USI4R0807301.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xad7032acf5b32e68b9eb05e11822d38d7c286879ef78077584b13e00a7b790d8. 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/USI4R0807302.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd6e0ece650213133ff80d5a9f20563d6b8a0103516d797de427a618c9a815dff. Chain 2 (Bitcoin): anchored in block 958622 (2026-07-18T22:58:55Z), 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/USI4R0807303.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x36d62b57f3fcde546b3c4a515e06c5e4d8d2a1eb43c4e22e58b0fe00a05d730c. Chain 2 (Bitcoin): anchored in block 957872 (2026-07-13T15:39:45Z), 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/USI4R0807304.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xe5c57528a2b5021dccf523b027be7bec493a1b7748d4bfe8c2d7b8ea919544ee. Chain 2 (Bitcoin): anchored in block 956639 (2026-07-04T11:19:20Z), 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/QM6P41592468.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa0292b0bf81f2b631676c92e81e4d5fb7a51a3ca7d41f85c112eef3bedb016af. Chain 2 (Bitcoin): anchored in block 956857 (2026-07-06T01:26:17Z), 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/QM6P41592474.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x15d4cbe524f0ef89ea2827cb8be2edf9f954645220525a6a6397de3a539172cc. 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/QM6P41592476.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xd831a2ee329125b6537ae5d0df6a593ef01508264dbb9bd7b19c82ef9f419654. Chain 2 (Bitcoin): anchored in block 956476 (2026-07-03T09:04:44Z), 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/USI4R0807173.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7fe6eb687f38a67d975049a9ac128496d079c1dbcdf539aeaa1f270224f81cc7. Chain 2 (Bitcoin): anchored in block 956711 (2026-07-04T22:48:52Z), 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/USI4R0807174.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x4ff605f4a6d23db8a0b86805b411a28605f1e1ab752f264e110e7cc3de43b9ee. Chain 2 (Bitcoin): anchored in block 957874 (2026-07-13T15:43:57Z), 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/USI4R0807185.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb13a4b6eb71da0ecfa1458049faf7ec3c00d7435c6086840b6d808dc629285f2. Chain 2 (Bitcoin): anchored in block 958448 (2026-07-17T19:49:21Z), 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/USCMG0400113.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x3b64ba348dd3cee9384a03e93b02290f28a0d78fa914d9d9bdab7b9369fec9df. Chain 2 (Bitcoin): anchored in block 956500 (2026-07-03T13:55:21Z), 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/USCMG9601731.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x5584478c43321ad17c045514d544a68d50504737573eecec8d4b86fb1840c2d0. Chain 2 (Bitcoin): anchored in block 956728 (2026-07-05T01:43:49Z), 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/USWR61100842.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xb0350ecbe16e843356d20f7b71f74e720b935a850d71569530039a8be779abc3. Chain 2 (Bitcoin): anchored in block 958554 (2026-07-18T13:17:01Z), 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/US6R21314732.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x58b33c7a5a51620d57d3b918ca700f9d716d9edacd8cc582c47c4fbabc17d7c3. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-15T22:40:25Z), 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/US6R21314734.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xa44bb5935d1e02d850e1c7738633068fa4b96cd8ff6d5c99dada879e1e18fd9c. Chain 2 (Bitcoin): anchored in block 958137 (2026-07-15T11:22:47Z), 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/US6R21314735.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x180d99ec3fb5cd9ecb3ce0c57fe5a41eb3ce3ff3137280a65dc7d945bcb2f7b1. Chain 2 (Bitcoin): anchored in block 956422 (2026-07-03T01:01:38Z), 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/US6R21314738.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0xc954e35b2e1d28ba9469e4609a8bcbe05e47257f3c72c1b9334b12be9320135a. Chain 2 (Bitcoin): anchored in block 958491 (2026-07-18T04:29:42Z), 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/US6R21314739.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9ab242e4fdbcd8dc94716f27c84e9f73febc21a4fe79e7cc0ddc6396f44dd31f. Chain 2 (Bitcoin): anchored in block 956420 (2026-07-03T00:42:11Z), 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/US6R21314742.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x7dec9857c46c6e280f429f54afb75e59747d863082542f4d62fb8d78fad64021. Chain 2 (Bitcoin): anchored in block 958208 (2026-07-16T01:24:07Z), 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/QMFMF1454484.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x9e103cc574a84338ccc7738cd8e646469d0943153b906b160070dbf79517f89b. Chain 2 (Bitcoin): anchored in block 958357 (2026-07-17T03:33:42Z), 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/USI4R0807309.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x89f21bcae98b3ed9da1df5f01d730753b7c247e50b3fa6f1a6b0e00b4029f8d7. Chain 2 (Bitcoin): anchored in block 958621 (2026-07-18T22:59:44Z), 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/USI4R0807319.
Dual-chain trust anchor. Chain 1 (CopyrightChains): CopyrightID 0x03dfb7c4b9fdf4834278f8eea77fc84e31abc566c42c949707843e7ec9d42f0f. Chain 2 (Bitcoin): anchored in block 953536 (2026-06-13T17:25:41Z), 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/USANX1400005.